I doubt it is the ball, the Polar Ice makes a great spare ball.  I would look at your approach and swing to make sure you aren't trying to muscle the ball.  I have a hard time keeping my speed down on my spares.  I tend to muscle the ball and consequently have erratic shot making.

Just stay relaxed.  You have a spare ball so there shouldn't be too much need in adjusting your release to make the 10-pin.   

Is your strike ball 15 lb or 16 lb?

That's interesting.  I tend to lose accuracy when I try to keep the speed down on spare shots.

Not so much "slow down" but keep a consistent ball speed from your normal shot.  If you are throwing reactive, then having higher speed will definitely benefit you, but throwing it hard and using a spare ball doesn't seem to make as much sense. 

Once consistency is established, then perhaps higher speed can be used.  I was only giving a suggestion as to why he might have issues going from 16 pounds to 15 pounds on his spare ball.

But if his strike ball is 16 pounds, then I have nothing.

All of my equipment is 15lb -- and has been for a while. To rephrase this --- I have been not as consistant  since I have switched over to the 15 lb spare ball -- maybe because the lower weight and it being a plastic  -- IMO -- tends to slide more and I dont get the roll I used to have with the 16.

If you want to try something, take the shine off the ball. Scuff it a little. If you don't like it, just polish it back up. Experiment. It's your ball, you know what you want to see.

I know many bowlers that have a plastic ball that has never seen a polish machine or even been cleaned. They like the beat up ball. It works good for them.


 

Perhaps you just need to try a few different starting positions and targets to see if one of those work better than what you are using now?  We, as bowlers, change over the years and what used to work at one time will not as well now.

That was my case.  I started to miss more and more corner pins and had to make changes in starting foot position and target to get back to a higher conversion rate.

Currently my 10 pin making is just horrid.

Are you missing the 10 to the right or the left???

Currently my 10 pin making is just horrid......Other than just practicing on the 10 pin, should I look at another spare ball?

I got a new spare ball over the summer; went from a Lane 1 XXXL to an original Columbia Blue Dot.  In the beginning I was missing left and right and couldn't make a 10 pin spare with any consistency.  I also thought about getting another XXXL, but instead just practiced my 10 pin spare and things have worked out well.  I think you just need to go practice and you will be fine.