Did you do back to back testing with 24mm and 30mm spindle chainsets then? Struggling at present to see how the spindle diameter could affect anything other than crank stiffness, and even then not any appreciable degree.
Well yes and no. I switched from a 110bcd 105 crankset to a 110bcd praxis works crankset. So yes it was the only thing I changed, didn't expect any change, got loads of it.
But I have to say, praxis works is known for their stiffness, so maybe not the most fair comparison with a 105 crankset.
Did you do back to back testing with 24mm and 30mm spindle chainsets then? Struggling at present to see how the spindle diameter could affect anything other than crank stiffness, and even then not any appreciable degree.