I would have sessions sometimes with good looking (0ish) red line but was never able to maintain, esp with 2-4 FR tables mixed in. donkpredator over at 2+2 (he's been banned like 5 times so no idea what his sn is now) usually had it in the positive when he posted a graph, maybe RS_Mig also, but mostly even the plo greats had negative red line.

I sorta recommend reading the HS PLO BBV/*** threads just to get an idea about this stuff although they are sometimes too frightening.