I'm running a setup similar to yours.... 82mm TVS, ID1000s on E85, and the VMP BAP. It's sufficient for now to run E85, and I'm safely seeing 23-24 degrees of timing with no fuel issues all the way up to 7500rpm. That said, the safer and better way would be to get a return style fuel system which I'm planning to do down the road... just check your data logs to make sure you're not losing fuel and you should be safe... I'd thinking you'd be pushing it on the 79mm but in my case I'm okay with the 82mm.