If you start the hcg week 11, you will probably need more of a kickstart for the first week. I would personally run it throughout most of the cycle, starting week 2 or 3. I would ask Swifto in his PCT thread, he is the hcg guy around here. You definitely do not want to run it all the way through pct, because the clomid is meant to stimulate LH and HCG mimics LH. You need to continue clomid at least 2 weeks past the end of hcg administration.