That is extremely helpful, I would imagine a proto might be slightly softer than the infinity if it were of the same size, which is exactly what I am looking for. Its also a true twin which is what I was looking for and the 152 in only half a cm wider than the 151 infinity, so I should be able to ride it easily. I can't stop flip-flopping but I think I am leaning more towards the proto 152 now haha
1/2 cm is nothing so scoff at. That's at the waist. You don't know with the sidecuts what the width is at the inserts, where it counts.
But if it's still between the Evo and Proto, Proto all the way.
I'd still recommend the right sized infinity with an adjustment to make it a twin.
Discussion on making the SL a true twin
But it's your call.