I ran a very similar cycle, but insted of A-bombs, it was d-bol.
6 weeks for an oral, too long, and after 3 weeks, I was barely noticing gains with d-bol.
If you never used tren, you should start with Acetate, anyways, 12 weeks tren E is too long, and 300mg too low.
I'd do 8-10 weeks at min 500mg, and test, maybe up to 750mg.
But it depends on how your body reacts with test, its up to you, but tren, my opinion, less weeks and more mg. and better Acetate if first tren