Nope. That was a lot of thorough text, but it didn't get the point across. You put in kinds of resistances in there to over complicate things, and I just can't be arsed to think it through right now.
Does +Def buff stack directly with -Atk debuffs or not? Because as long as -50% Atk and +100% Def together don't mean 100% damage reduction, it severely makes Def buffs weaker.