You need some sort of collector to hold fuel to the pick-up when cornering. Pretty easy to install while building the tank. But you'll need to cut the tank open to install now.
Something like this might help. Works well for a street car, but not enough for racing.
https://www.tanksinc.com/index.cfm/p...rod/prd609.htm
I would also recommend the Holley HydraMat. I have one in my race car and it works really well.
If you're getting a lot of spray from the return line, that's a problem. It tends to aerate the fuel, and that's not good. It can run lean, and the bubbles can damage the injectors.
Use a length of hose to move output closer to the bottom of the tank. Preferably back in to the collector.