Sure, but only have 100k hands or so (so basiclly insignificant sample, since it's then only like 10-15k hands from the BB), and I definitely make a lot mistakes postflop as well (just as everyone). But in the big blind my lossrate is -41bb/100, not sure what's average or whatnot, but I guess if you just fold every big blind it's going to be -100bb/100. So recouperating 60% of my big blind at least in 6 handed.
What would be more interesting to see would be to filter how you're doing when you're calling a minraise from the big blind without a big hand (ie you filter out all broadways, SCs, pairs etc), and compare that winrate to the winrate you would have had if you had just folded those hands instead (100bb/100). Unfortunally, since I only have 100k hands, that's going to be so few hands that it's not really worth looking into yet, but once I get some more hands I'll definitely run some analysis's there.
Edit: Just ran the filters anyway, filtered out everything that is normally considered OK to defend with, and so far I was actually up money with these hands. And yes I realize that's obviously not sustainable, and sample size is obv way too small, but still it's good to see.