Usualy with any of the gated sumps i know of there is always 4 gates and they are layed in a dimond patern rather than square to the sump.
also i cant quite see but the oil fitting for the return from the head has to be on the passenger side of the engine. we have seen recently 2 race engines with fittings on the drivers sides presureising the head and not allowing the oil to return.
There would be twice as much force under braking than cornering in this car. if it was a circuit car with stiffer suspension and bigger grippier wheels than the corner Gs mite be grater but definatly not for tarmac.
Ben and i both know that this is not a common problem but we have also studdied the data that we have at hand and experiances we have had and have worked out that all the race rb20 we work with suffer from "extreemly low" oil pressure under heavy braking. its somthing that can easily be fixed with a combination of things that in total will be less than 1k.
Remember that theres only one reason engines spin bearings. you can chose to risk it and see how long the wrecker motor will go, or add preventitive measures to stop it happening half way through targa or at the end of a championship searies.
in the first page of SKs oil in rb's thread he says if your doing any kind of motorsport you should have a winged and baffeled sump.