Last time I weighed myself, I was slightly above 90kg, at 1,83m. Not big at all in fact, which is why I dread to weigh myself and I avoid it at all cost, lol.
Up until this year, I never went above 300 Test, perhaps that explains it, lol. The doses I am using now are insane for me, the most I used previosly was like 125-150 Test E with 500 EQ, stupid me, but never mind, or 250 Test E, 360 Deca, 30 Dianabol (that actually got me cut, not intending on that as I had no idea what I was doing at the time, or ... perhaps even now, lol, but the happiness only lasted until I got slight gyno).
Anyway, my plan, let's call it, as it's not much of a plan without an actual deadline, is to grow into my weight cap for Classic, then compete once to get it out of my system, or perhaps like it and compete more.
I am the same as you with holding deficit, in fact, for me it's easier to NOT eat than to eat in surplus.
The good part for us is that, in theory, from those who have done it, once the difficult fat is gone, it does not come back the same way, but more uniform.
I get you about the Mast, for me it's the compound I never used but wanted to stock up on, which I never did and now it's kind of expensive. But at least I have Test and Primo and Tren from QSC to last me a long time.