Brickguy - you've got me confusd! 

First you say Motiv's cores in lighter balls are nearly identical to the heavier balls, then you go on to say "However of late, they are producing few balls with those same rgs and differentials as the balls I mentioned, have. Most of their balls now have differentials in the .020 something up to the mid .030's or so, thus I have begun looking elsewhere and am exploring my options"

FWIW, I'm not trying to troll you.  A few around here will tell you that RG does not matter. Certain layouts enhance differential - look into layouts to increase differential into that zone you're comfortable with.  I would not get super hung up on core specs - especially since you are not going for high-end asymmetric hook monsters.  And as already said a billion times, cover is the most important aspect of the ball.

And finally, I applaud the effort you're giving in light of the health issues.  Good luck in your comeback!

I agree with you on the rg's. I have no problem there, but do have a problem with the differentials. I have always done better with high differential balls. I also agree that the differential can be enhanced...... to a point, that is. With my doing best with differentials in the range of .048 and up, you can't take a ball with a .020 differential and make it have a .048 and up differential.

For your being confused over what I said about rgs and differentials, read amyers post as he understood what I was saying or trying to say.

And ... thanks for the nice comments in reference to my health

 
Brick, I think your stressing too much over the core. For my ball selections, I don't concern myself too much unless the RG and Differential numbers are at the extremes. If a generic core still has decent specs, I wouldn't dismiss the ball. That's what I looked for when I recently purchased a 13# Brunswick ball for my daughter. The core is the 12-13# version, but it still has plenty of backend movement. 

Steven, I don't stress over rgs, but do get concerned and rightfully so, over differentials as mentioned in 2 different posts above this one. If a generic core with good specs was good enough in any ball, then the ball companies would use the same generic core in every ball they make. However, they don't do that. They put different cores in different balls for a reason and in addition to different covers, these different cores give different shapes and looks for each line of balls. Some are made to flip, some aren't made to flip ... some are made to break late and some early, some are made to arc and some not made to arc and etc.

I realize that you don't concern yourself over rg's and differentials but I am sure there is something you concern yourself with when you buy a ball and in my case, I concern myself over differentials but not rgs, but I doubt I concern myself over the same things you concern yourself over when you buy a ball. To sum it up, we all have concerns when buying a ball but each of our concerns are different from the other person.

FWIW, the advertised RG & Diff are of balls without holes. After drilling the new RG & Diff aren't anything near what the advertised specs are.

http://www.stormbowling.com/products/balls/punchout

The diff in the generic core in the Punch Out at 13lbs (.045) is higher than the diff in the 15lb ball with the Turbine core (.038).  This could possibly fit under your Rage and Octane.

Thanks. I may just look at that ball when-if  I am able to return to bowling again, hopefully sometime in Nov. as well as any other balls that might surface between now and then. I like the shape on the lanes they show on that ball also. That generic core just might work for me.

Just my personal opinion;
You have to look at the entire reason for a design ,and intent. There is a high probability that lighter weight balls are being used by people who are going to be throwing the ball "slower" than average. In the prop shop industry, it is more often than not, that slower speeds tend to have better ball reaction with less aggressive core numbers. So with that said, it makes sense that lighter weight balls will use cores that have higher Rg's and less differential built in to it.

I hear ya and agree with you about slower speed people. However, In my case, I throw 12# harder than 14# & 15# and throw 13# harder than 14# % 15#, but not quite as hard as 12#. Thus, I need aggressive core numbers. I don't throw 12# & 13# balls because I am 78+ and an old man. I throw those light weights because of back problems.

I just had my second back surgery last week, having had my first one 22 months ago. The Dr told me 10# on bowling balls, especially considering that I may have to have 2 more vertebrae repaired in the near future. I fussed with him and he finally told me 12# and no more. 9 months ago, I sneaked up to 13# and now I am out again.

To sum it up, were not for my back problem, I would still be throwing 14# & 15# bowling balls @ approx 13-14 mph. With 12# it is more like 14-15 mph or a wee bit more, thus the need for aggressive cores.