Kinetic fist and infusion (bowling / enervating etc)

[Ystear Fearis]

Everything is pretty much in the title, building an elemental ascetic I had this problem.
How does kinetic fist (or in the same fashion, kinetic blade) combines with infusions like bowling or enervating.

Let's talk about enervating for example:
While flurrying, does enervating applies to each "hit",does it only applies once, or does it just not combine at all ?

The first option seems clearly overpowered and I as a GM would use the second interpretation, but as I couldn't find any real precision, I am still asking how it would work according to RAW by curiosity.

["Dragonfly"]

As a 3/4 BAB class the Bowling Infusion becomes less useful as your opponents' CMD outpaces your CMB. Fun at lower levels, though.

Enervating can't be acquired until 17th level, so it makes sense that it seems powerful. I'd probably opt for straight damage by that point, though.