Something to mimic the roll of the Break S75, that plays on the same conditions. I don't about what core it uses, what the color is, as long it does the same thing and doesnt end up cracking on me.

JS
I can relate to that. I have figured out that I can make some of the new stuff work by using a 65 X 4 3/4 X 35 and than polish it on top of box finish. I do make it very shiny .  I have had great success the last few weeks using this drilling. I am now able to use the Guru and Score as well as the Reax version 2  solid.
But that doesn't mean to say your suggestion won't be considered. 

Thanks for the reply Phil.  I don't want to hijack this thread but I do have a question that may benefit others on here (it's always great to get someone with your knowledge and expertise on these forums).

My Guru and Score are very close to your layout; I used 45 x 4 7/8 x 30.  My Yeti Uncaged is 80 x 3 1/2 x 60 and my Gusto 85 x 5 x 50.

Now, here's my question.  If I was to use a 65 x 4 3/4 x 35 layout that would put the mass bias in my thumb.  Any problem or issues with drilling into the mass bias?

No issues. Actually the mb on mine fall just under the thumb. But still no issue if it falls in the thumb

I dream of a ball which I can use to bowl up the boards (roughly 2-7) on flatter medium patterns. This ball glides through the heads, starts to read in mid midlane and then moves steadily inwards towards board 17 in the dry. Medium strength coverstock and a medium RG core with an RG diff around .40.

Honestly, my ideal ball motion is to be relatively smooth through the head oil, gain traction at the end of the pattern, but not go go sideways. I want a strong move, but a hook not a flip. I would love to see a strong roll through the pin deck with very little deflection. A motion that looks to actually accelerate after the break and not stop until it leaves the pin-deck.

I have perhaps a little different perspective than others.  Being a lefty, I generally spend more time playing more direct through the front, with a smaller launch angle, and don't have as much friction at the breakpoint.

Like everyone else, I think the ball must get through the heads.  Nobody wants a ball that hooks at their feet.

I prefer a ball with a good midlane read.  Something "roll-y", usually with a shorter, fatter type of core.  This gives me more control of the midlane, and usually a more predictable breakpoint.  I generally get into trouble with something that completely ignores the lane until it gets to the breakpoint.  Sometimes it will jump, but other times it can have a tendency to "squirt", leaving a variety of designer spares.

From the breakpoint to the pins, I prefer more of a strong arc.  I realize the sharp, "Oh my God, did you see that?" reaction is sexier, but I prefer long, boring strings of "ten in the pit" over the occasional thunderous, messenger-flying hits mixed in with "What the heck is that?".  And since I'm normally playing less launch angle, having a huge recovery and excessive entry angle is not necessary.

The ball must have some coverstock versatility, so solids or hybrids seem to work better.  It is a rare pearl that can give enough of a midlane read.  The core must be able to give a good variety of post-drilling differentials and reactions, but since that's a given with all the Radical designs I can't believe that would be an issue.

Anyway, thanks for the opportunity.  It's always refreshing to see a company that is actually interested in what the end user thinks.

Ideal ball motion for me is if I look at the half moon.  I want even shape almost the entire way down the lane, but without what one would consider "roll-out"  Ball still has to go through the pins, tip through the pins, whatever you want to call it.  But I don't like hockey sticks, and I have really liked the Radical brand for this control factor.  So I guess this would be different than a typical ball reaction because there would be minimal skid phase, more hook phase and less roll. 

I know Im out of the 100 guys to reply, but something i would like to see in a ball is a small core but assymetric which help the ball to get a nice lenght and a massive back end, maybe sanded on the cover to help it be more controlable result: Benchmark ball for any type of oil since you will get massive back end, nice roll and control thru the midlane part.
Something that allows to play deeply and play straighter.