75-100 are the sweet spots for hdrol, that is a very low pstaz dose, you can either hold onto it for later, or accept that it will be a mild hardening agent at best at that dose (both the 200 and 250, 300+ is where is starts to really show what it can do).
The general way to go with a steroid for maximal keepable gains is to run the lowest dose that is giving you good gains for as long as possible provided you have a proper pct ready to go.