I would hold on to the Mast and just run the test man... if you have enough for 500mg per week I'd start around there.
AI's are aromatase inhibitors they keep the testosterone from converting to estrogen which is where a lot of your sides would come from. Inhibiting estrogen= optimum testostorone levels
They'll help you keep your water retention down as well. I'd run the AI through your whole cycle and PCT as well.
Another thing to consider is adding HCG. You could get away with 250mcg's twice a week. This will keep your nuts from atrophying and help with ease of recovery during your PCT.
Nolva - Tamoxifen is an
antagonist of the
estrogen receptor in breast tissue via its active metabolite, hydroxytamoxifen. I would have this on hand in case you start experiencing signs of gyno... but don't use it until you need to. Letro is another option if the gyno gets a little more out of hand.