Do you clean it regularly? How often do you use it? Have you tried any surface changes?
i only use it for 3 games every tuesday and then clean it as soon as the set is done...before it even goes back in my bag...
have not tried any surface changes...it seems like the reaction is the still there but it has lost some of it's hitting power/carry...
what would be a surface change to consider?
sounds to me like its not the ball, at my local alley there are a few pairs that have off alignment pins and the carry is much worse. There are 3 pairs where the do the semi finals,and finals of the king of the hill tournaments and the pins are spot on and you can tell the difference. But that's my experience with good reaction/bad carry....
just to tell you I'm a high rev / med-high speed bowler and the pair I had last Friday was off alignment and I left 7 solid 7pins on pocket shots and about 4-5 10pins ...
I'll double all the above as possibilities: different lanes in the same house, changes in weather, lack of maintenance on the oil machine, change in oils used or cut back in stripping of the backends.
All coverstocks absorb oil over time, be they polished or dull.
Plus, have you re-polished the coverstock? 6 weeks of use of a polished ball will wear the shine off most balls. It might be too dull for the oil you're seeing now. Surface maintenance is at least as important as cleanliness to consistent ball reaction.