No expert but I find .5m difference between a 4.5 and a 5 feels vastly different than between a 6.5 and a 7. It feels like a sliding scale of size jumps that grow like say .5M then like .7 then 1M then 1.5M make sense to me. so something like a 4.5 a 5 a 5.7 a 6.4 and a 7.9 seem the perfect ideal sizes to start looking from.
