You're probably right. I doubt its causing you greif to reuse the fuel. I am new, but EVERY flier I know pumps it back into the jug and reuses it. I have personally used a leftover jug from my first venture that had roughly a quart and a half left in it from 5+ years earlier, that had been run like described putting the leftover back in the jug. I had no issues, at all. At nearly $20 a gallon I see no reason to waste fuel that is probably good just because one or two people have had problems, especially with so many who do not.

I do however religeously use after run oil even though my fuel says I dont need to..

I suspect your dead sticks are caused by something else, tuning, air in the fuel line or other.. I had a stream of them, no more than 5. I had a veteran flier help me retune and they went away.