Compared to the heat that the oil gets from the pistons and cylinder walls, any pump heating in this case is nothing in these pump sizes, so to not run modestly higher pressure to avoid a trivial amount of oil heating is a poor tradeoff IMHO. We are only talking the difference between 55 psi and a 72 psi spring in a SBM pump.
And 7-8 psi at the gauge port means roughly 0-2 psi feeding the rocker to shaft interface. For stock rockers and springs where there is really no oil pressure at the rocker to shaft interface, all you need is a bit of flow and splash. For fancier rockers and high pressure springs, then you are wise/need to have better and better pressure to keep positive oil flow through the rocker system and keep positive oiling pressure to the pushrod cups, rollers, etc. Depending on the setup , there are around 5-7 restrictions between the lifter gallery and the rocker-to-shaft interface, plus the 'interruptor' action in the cam, that cuts pressure way down to the LA rockers.