My experience wouldn't lead me to put them on a Proto. I would be looking at SF45's and DMCC Lights from Flux. TT30's at the least. Putting a softer binding on a stiffer board make your muscles work harder to get what you want out of the board. It usually only makes sense if you're only riding powder on the setup and are aiming for a surfier feel.
Overall, bindings I recommend for the Proto are SF45's, Raiden Phantoms, Flow NXT series, K2 Company, or Rome 390's.
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