Comparing 115s and 147s is apples to oranges, most factory 9mm loads with 115s are sub minor or barely make minor so that's not a valid comparison either. A 115 without a comp is a very snappy round which is why very few USPSA shooters use them.
If you're going to reload, you really NEED to use a chrono; I guarantee where you shoot USPSA there are dozens of chrono owners, just ask someone to use theirs. The general rule of thumb without a comp is heavy bullets and fast powder, with a comp it's the opposite: light bullets and slow powder. How many 115s do you have? You might want to sell/trade them to an Open shooter; lots of 38 super guys use 115s, as well as some 9mm guys. I shoot 115s in my Open guns and 147s or 135s in my Production guns.