550-XD converts to 19norTestosterone...non methylated reducing DHT effects. OTC PCT is plenty for 550-XD it is a very safe PH. I always recommend PH users to keep a SERM on hand just in case, but with my experience PCT Black and Pure Test DAA will drop your boys just fine.
Yeah I see what you mean bro. On the other hand you would still get excellent results dosing 2 caps per day from 1-2 bottles. We will have an opportunity to try our new 1-Alpha which will release very soon, keep a look out for it, and put your name in for logging opportunities. Finaflex is very generous to its loggers supplying them with a full cycle including PCT.