Hmmm, if you strongly identify with Ni and Fi, how about IEI or EII? Both those types have 4 dimensional Ni and Fi and, although either type doesn't value both, they demonstrate the other one so they may use it a lot in private. If you're ESI, Ni would be weak (2 dimensional). Also, as far as differences between ESI and IEI, one is gamma and the other is beta. Looking into Reinin may also be a good idea. As JuJu said, figuring out if you're Se seeking or Te seeking is a good idea, too. You can click on the functions
here and read about suggestive Se and Te. If you're ESI, you don't really need help with Se but be sure to also read about creative Se there.