Thing is fixed AP round on Chi-Nu would despose of M4 Sherman easily as well as tanks like T-34-85
One possible adjustment that would help greatly is just improving the slopemods for uncapped AP shells, and there is some degree of historical validity to doing so.
There is, the values above stated are with using wwii ballistics AP slope modifiers. Since AP doesnt deform at 60 degrees, using 0 degree value after it deforms at 0 degrees wouldnt be accurate and would give underperforming 60 degree value. so i used 0 degree penentration value the AP would achieve if it didnt deform and used that figure with slpe modifiers to calculate sloped penetration instead. This approach of calculation gives me the same value as T33 APBC penetration graph stating 97mm @ 0m at 55 degrees and for Tokku Kou AP it gives a value which would allow it to penetrate frontal sherman armour up to 600m
In either case I’d imagine that would probably require a bug report demonstrating the methodology and having a reasonable background of citations, but for what its worth, there certainly are avenues to help balance tanks, although that remains the primary barrier.
Japanese wwii gun penetration if implemented correctly
Type 94 37mm
Type 94 APHE (0.7kg at 575m/s)
40mm @ 0m (0 Degrees)
18mm @ 0m (60 Degrees)
Type 98 37mm
Type 1 APHE (0.726kg at 704m/s)
52mm @ 0m (0 Degrees)
24mm @ 0m (60 Degrees)
Type 1 37mm
Type 1 APHE (0.726kg at 800m/s)
63mm @ 0m (0 Degrees)
28mm @ 0m (60 Degrees)
Type 1 47mm
Type 1 APHE (1.49kg at 810m/s)
82mm @ 0m (0 Degrees)
38mm @ 0m (60 Degrees)
Type 2 57mm
Type 1 APHE (2.7kg at 810m/s)
96mm @ 0m (0 Degrees)
47mm @ 0m (60 Degrees)
Type 3 75mm
Type 1 APHE (6.56kg at 668m/s)
97mm @ 0m (0 Degrees)
51mm @ 0m (60 Degrees)
Tokku Ko APHE (6.615kg at 683m/s)
118mm @ 0m (0 Degrees)
53mm @ 0m (60 Degrees)
Type 5 75mm
Type 1 APHE (6.56kg at 824m/s)
131mm @ 0m (0 Degrees)
67mm @ 0m (60 Degrees)
Tokku Ko APHE (6.615kg at 850m/s)
161mm @ 0m (0 Degrees)
70mm @ 0m (60 Degrees)
Personally I want to see Navy’s both 12cm SPGs.
Short 12cm gun in Chi-Ha new turret can destroy M4 tanks, and 10th Year Type 12cm AA gun on Chi-Ha seems funny 
About premium SMG, I want to see Experimental Model 3 SMG, a prototype of Type 100 SMG.
It have extremally long bayonet lug and total length was 1,100mm! (Type 99 short rifle is 1,118mm)
When equip 30th Year Type bayonet, total length is 1,490mm!! It will be longer than some rifles.
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By the way, SMGs are important but LMGs are important, too.
No we don’t have even Type 99 LMG, the standard LMG of late-war Japanese Army!
I find some interesting guns so I share you.
Field-modification of Type 98 Swivel machine gun (九八式旋回機関銃)
License production model of MG 13 machine gun for bomber’s rear flexible mount.
It’s hard for me to distinguish Ko (7.9mm Type 1) or Otsu (7.7mm Type 89) in this photo…
I think field modification of both Type 98 swivel MG and Type 97 7.7mm fixed MG will be very attractive for players.
Photo
Experimental Type 1 LMG Model 1 with periscope
The navy abandoned periscope project, but the army made periscope again in 1941.
Exp. Type 1 LMG model 1 is early prototype of Exp. Type 3 LMG.
Model 3 is warfare design of Type 99 LMG with magazine affected from Czech machine gun.
Funny modifications of 11th Year Type LMG
11th Year Type LMG was the first Japanese adopted LMG, so there were lots of interesting variants.
With periscope
I’m not sure it is useful in the game, but the navy designed periscope for 11th Year Type LMG and Type 38 rifle.
With flash suppressor
Army designed flash suppressor for LMG.
It will be unique premium gun, but I’m not sure its useful in game.
With expandable bipod
Expandable bipod. You can mount on ground it without laying down!!
For anti-air, connect both leg to become monopod. You can mount on ground while standing! 
With 35-round box magazine
Experimental update to equip 35-round box magazine and simplification.
Finally this project was abandoned and they focused to build new LMG instead of improve 11th Year Type.
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