To be clear, I don't think you're using up fuel in the straights. I think you're using up fuel anytime you're on the motor - period. Including in the turns. I think you're sort of on the right track for a solution but it's a different one than I'd pick. I'm just not a fan of electric pumps on non-FI motors if there isn't a good reason, and if you have a stock type tank and a carb I MUCH prefer the reliability, performance and simplicity of a good mechanical pump. That's just me.
I also do NOT like internally regulated pumps. I strongly prefer a separate, distinct regulator after the pump. Also a personal preference, but I cannot imagine ever using an internally regulated pump myself. Far too inflexible and frankly more of a maintenance challenge. No upside for me.
-8AN to the regulator (meaning from tank, through supply and pump to regulator) will serve you well. Anything more than 3/8 to the carb from the regulator will be overkill, but -8 won't hurt. It does make plumbing a little more bulky and packaging a little tougher.
In any case, directionally you're definitely heading in the right direction.
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