Regarding oil pressure with vs. without an oil cooler:
https://www.ft86club.com/forums/showthread.php?t=91820
From this data it looks like with 5w30 and no oil cooler, oil temps get up to ~275F and pressure is ~7.5 psi/1000rpm.
WITH an oil cooler and 5w30 oil, temps are down around 250F, but pressure is still ~7.5psi/1000rpm.
Theory: increase in pressure from cooler oil is exactly negated by the pressure drop from the cooler itself, maybe?
Anyway, I haven't seen any evidence that I *need* an oil cooler for my track usage, so for me, IMO it's not worth the cost/effort/risk of having one installed.