Mark, fwiw, whenever I have a question about the weight to use for something like ETK or ROTK, I always err on the light side, but the other half of the story is that, when heavy day rolls around, I skip levels as I'm able, so my first pass through the program won't take as long as usual. I liken this to the "preparatory cycle" you'll find in some of the Russian powerlifting routines.
E.g., the ETK ROP is about a 12-week program without the test at the end. I've gone through it in 4 weeks with a lighter weight and then started it up again with a heavier weight, usually without any break between cycles, and trained it for the full 12 weeks.
-S-