Are you still running the stock hard fuel lines to the engine and mating them to the braided lines? I'm running a Walbro 400 and have heard the stock lines are restrictive and that from the pump outlet to the rail should be closer to a -6. I'm also trying to figure out if/how the tanks feeder pump can put enough juice up to the Walbro on a sustained corner on a road course. I could see (in theory) a long corner with a half tank getting pushed to the non-fuel pump side, the walbro sucking all the gas up, and the feeder pump not replacing it fast enough. Not sure if this is stuff you've addressed or will need to, but thought you might have some insight to it.