Ive got an EFi in tank pump, and i never got the issue under hard cornering until i turbo'd the car and fitted an uprated pump. But i guess as the demand for fuel rises and any momentary shortage in what the pump can draw will have a knock on effect.
I don't really have the funds or desire to go for an external pump and swirl pot etc... So was hoping an accumulator could help?
If not, maybe an MFi tank/pump feeding a small swirl pot in the spare wheel well the on the the filter/fuel rail.

Its only under 1/4 of a tank i get the issue, also the EFi tanks have a swirlpot inside, albeit a very poor designed one!