Well I think in function pairs. Because Fi would have a bigger say in an INFP's psyche, more of the relative power would belong to Fi. Fi should be able to reign in Te.
Fi should be less in control, and more subject to the influence of Te in ExFPs.
Fi should be more in control, and less subject to the influence of Fi in IxFPs, at least consciously.
The inferior function erupts by corrupting the dominant, however an IxFP that is healthy will likely to be able to ward this off. It is likely there is an external social reason for the frequency of Fi maladaption, probably the fact that Te, the largest part of their unconscious and the weakest part of their conscious, is arguably the most prevalent function in society. Fi always has to fight uphill, much like Ti. INxPs are not known for being well-adjusted.
Like this:
Blue is Fi, red is Te. Imagine that bigger circles go under the smaller ones, so it does not look like the tertiary has less area than inferior...
IxFP
ExFP
And of course those apply for whatever type..