Chi-To is much better than Chi Nu II in multiple aspects.
Chi Nu II would be fine at 4.0 unless you want to increase all 75mm Panzer IVs.
It absolutely should. No matter if 3.3-3.7 Panzer IVs are undertiered or not. Chi-Nu 2 is barely worth different br from those. 4.0 is completly reasonable.
No, you don’t need to continue. It’s clear from your explanation that you are garbage at the game, since large weakspots are apparently unhittable for you. I am thus not going to waste my time further while trying to argue with someone that so cleary has little idea how to play the game.
Dude, you do realize the Panzer IVs have a far worse drop in terms of range. The Type-II 75mm still out beats the Panzer IVs in the range department.
Also, the Chi-Nu II was moved up cause it was sealing clubbing those at 2.7, 3.0, and 3.7 vehicles. I know cause i have every Japanese WW2 vehicle and i used them when they were still at 4.0 and 4.3 while all retaining a 4.3 reload.