First of all almost everyone has ablation (RAI-131) after TT. Not everyone goes through hypo hell though. I did thyrogen as many do now; no need to go off of meds. You didn't mention the LID diet, but you're usually on that for at least 14 days before you start the treatment.
If you go hypo, I've read both; start back on the pills right after you take the RAI pill and others wait until after the WBS. Now I'm not sure why you're waiting 11 days. Almost all of us do/did the following:
Shots on Monday and Tuesday, or of course go hypo about 3-4 weeks prior to treatment if that's the way you go. RAI pill on Wednesday. Isolation for 72 hours or more dependent on the strength of the RAI. WBS the following Wednesday. Off of diet and life goes on except you'll lose your taste buds right when it's time to eat normally again! ;D
Someone who went hypo may tell you differently. Good luck!