you played 1500 hands of 6m
that doesn't mean you're bad at it

also just because you have a negative balance on TPWK doesn't mean if you fold those you'll be way farther ahead
you only went to showdown 20% with them, so if you folded them you'd have only a little bit more

but yeah, you can't just fold all your BB and SB
I think you're correct in your calculation that you made up for some of the losses by picking up some hands in those positions