Russ,
Yes, I did/am going thru a small version of hell in bowling. It is or can be a combination of several factors. The right ball plus the right release on a lane surface + an oil pattern winds up being a matter of trial and error with a whole sh*tload of analysis.
I finally gave up on my normal release and my normal range of balls. The problem, I believe, in my case, was bad old wood and totally burnt out track area on every lane. Unless there was heavy oil (which on this very old wood, appears to look like medium to medium-heavy oil pattern), the lanes play such that the only choice is to play the track area with a small, 1950's style hook.
I wound up using a Monster Slay/R drilled 5x5 and throwing hard, with maybe 150-175 rpms, flat. bent wrist, suitcase style release, thumb at 9:30, fingers at 3:30 or so, "swinging" from 11/12 board at the arrows, "out" to 10 board at the breakpoint. Anything else left a pin somewhere: 4 pin, 10 pin, 8 pin, 7 pin, 9 pin. Even then I left a ringing 10 pin sometimes. Speed was ramped up 2 - 4 mph over my standard speed.
Oddly, in practice that day, around 2 PM, there was what I'd consider normal oil. I was able to play my CrunchTime (drilled 5.5x5, pin over bridge) standing 23/24 hitting 13/14 at the arrows out to 6/7board at 45 or so feet down the lane, hitting the ball (nicely, maybe 350 rpm, 16 or so avg. mph, with my normal speed and revs and watching the ball come back nicely. Shot two 250s or so after a warm-up game. haven't seen that shot in league since October.