I have done many experiments with Pinsa dough in the last three months. The soy just tastes weird and the rice smells weird when warm. Once it cools, its less perceptible and the crumb is soft and airy with a real brightness but at what costs. My favorite combination is 10% Spelt or 5% spelt and 5% faro.
I must have done 30 different tests and that's what I found.
The best hi-hydration dough (77% hydration) for me is (about 75%) Manitoba type 0 flour from Mulino Marino, (about 15%) Molini del Ponte Maiorca flour (Sicily) and 10% Spelt flout from Bob's. Best in crumb, flavor, cook, crunch and texture. As much as 142 hour cold fermentation has been done with great success but somewhere around 108 this is amazing.
Cheers!