Been diving into Ignition data for my 85k hands at 50nl/25nl reg tables and have found some interesting things.

One possibly unintuitive insight I've found is that population folds close to optimal vs. 3-bets in BTN/SB, but vastly underfolds in spots like CO vs. BTN and EP vs. BTN. Although population unopened PFR stats are tight, so what is "optimal" is gonna change slightly, but you get the idea. They also don't 4-bet enough, so I guess it comes out them under-defending in SB/BTN

Unopened PFRs:
EP: 15.7%
BTN: 35%
CO: 24%
SB: 32%

Fold steal BTN to 3-bet %: 54%
Fold to 3-bet in SB vs. BB 3-bet%: 43%
Fold to 3-bet in EP vs. BTN 3-bet: 35%
Fold to 3-bet in CO vs. BTN 3-bet: 45%

HOWEVER, pop also under-3bets from the blinds

Drivehud2 is awesome btw