QUOTE(BlueWaterSplash @ Mar 15 2021, 10:58)

Reached the maximum of 30% Overwhelming Strikes and 75% Counter-Attack on Block/Parry at level 277 and 297 1H Proficiency. I probably reached this point on my original character much earlier because I had all Legendary equipment at this point, whereas I have mostly Exquisite and Magnificent garbage in Isekai due to much faster leveling multipliers.
I've primarily used Dual Wield though in Isekai, the same as I did on my original character.
After changing my fighting style to my endgame Isekai planned build and
exactly rebalancing my proficiencies (not an easy task since HV 0.85 and I've also done it on my main account before) I reattained the maximum of 30% Overwhelming Strikes and 75% Counter-Attack after reaching level 285 and 308 1H Proficiency, with better gear at mostly Magnificent quality.
Still using an Exquisite ethereal rapier and shield though. I've dropped 3 better Magnificent and Exquisite prefixed rapiers, but prefer to use ethereal. It's probably time I swapped to one of them...