i dont think ive ever dropped to less than 20psi on any surface or any rally, tbh, and dont forget were talking a relatively large torque 2wd , the back tyres take a fair bit of pain, the only time i will run pressures as low as 20 or maybe a psi or so less is if the track/surface temp is very cold, and ive even been known to put cuts in the tyre to aid fast warm up
im glad we can actually have a decent discussion about something as well, makes a big change to 'ive drunk 52 stella's and my girlfriend left me ! "