Thanks all.
Brian, that's a question I've been asking myself. Particularly in the first 4-5 weeks of TCC, I don't think I pushed myself as hard as I should have. In my last cluster of three races last week, I did feel that I had declining power coming out of corners and on surges. So I'm pretty sure that I peaked a couple of weeks ago, but what I didn't expereince is some flaming crash where I just knew I had nothing left, so I probably didn't take TCC to its full potential. And that probably answers my question about weights v rest.
I have to be off the bike this week anyway because of work. After that, I plan to gradually get back into it, including weights for about 4 weeks, then take another easy week, then either re-start TCC or some other structured, interval-based program to prepare for mid-August. I may even follow rkwaki's advice and just keep on lifting.