Water oscillation most affects pool return eyeball fountains as opposed to foaming fountain jets by a Mfg such as Crystal Fountains.
Do you know which type your pool builder has spec'd in.
My guess is that it's pool returns eyeballs. I say this because if I'm tossing them in to close a deal they're very affordably installed.

I'm curious, how much of an allowance have you been allocated for the fountains?

On another note, I think two 300 lamps placed where they are now will do fine, you could even drop down to two 250's.

See ya,
Kelly