Scott,
I have said this before, but I think in your case the wheels are not going to come off. I believe that you have been bowling awhile now since your comeback and you have worked hard and the result of that is your game has gotten better.
Sure slumps will come, but you have to remember how you are bowling now. Remember that you have been there before, and you will be there again. And you will get even better as time goes by and you continue to develope your game.
Its what I'm struggling with right now. I have bowled poorly in the past, I worked at it, got some coaching help and got better.
I have a couple of 300 games, and have had some pretty decent (for me) series in the past, not as consistant as I'd like but some success all the same.
Now I'm struggling, but remembering that I have had success before is whats keeping me somewhat sane.
Don't wait for the other
shoe to drop, enjoy your success. You have worked hard to get it.