I'm right there with you. While my THS average has never been as high as yours, I still felt that I could compete at tournaments. I've been to a few now and I have averaged 160s, so defeating and demoralizing. I started practicing more, attended an IAB Bootcamp, and invested in my game and equipment. I still cannot figure it out and my league average has dipped quite a bit. I'm back to just having fun with the guys one night a week. I may go to a few more tournaments, but dropping into a handicap division until my tournament average comes up.
That all being said:
Spares spares spares spares, it cannot be said enough.
Targeting is important, but it will be difficult to simulate the transition that will occur and staying ahead of that is what the pros do so well.
Basically you need to be able to consistently repeat shots. Speed, Revs, rotation, it needs to be the same if you want to be able to make an educated decision on what needs to happen on the next shot.
When the lights go on at the next tournament and you step up on the approach, you need to "hit play". Meaning no thinking about the past, no thinking about your feet, arm swing, shoulders, or knee bend...just breathe and bowl. After each shot you can think about all of that stuff and think about how the ball reacted or didn't react and make adjustments.