I don't really know, but I assume your last 2 weeks would be fine. I don't know if there is any evidence to back up testosterone affecting beta receptor regulation, so there isn't really a good or bad time to run it.
It would suck if you stacked clen sides on top of post cycle therapy (pct) sides, so I say use it 2 weeks before post cycle therapy (pct) or after post cycle therapy (pct).
BUMP for someone with more knowledge..