I have done tren from 37.5mg ED, to 150MG ED, the only difference i noticed between 75mg and 150mg is alot more sides. Stick with the 75, you'll do great on it. And as was said above, when meds(gear included,) expire, they dont "go bad, and turn into something poisonous," for the most part, they just start to lose potency, and the initial lose in potency usually doesnt occur for about a year or so after the expiration date. So after 2 years, your 75mg tren might only be 70mg. I dont think i would trust fina conversion for that long though, the tren is fine, but who knows what all the binders and other leftovers are doing 2 years later.