Are you ever going to implement the type 97 20mm AT rifle or the type 4 70mm AT rocket launcher for the japanese? With the current developments right now, once the US gets their tank online and the bazooka the US will always win a map with a tank. Since the m3 stuart will easily sit back where the japanese cant attack due to combat zone restrictions or flamers, tank HE, mgs will cut down any banzai charges that attack the tank.
All these weapons still gives both sides a level playing field since the type 97 must aim at a US tank weak points or the fact it must deploy to shoot the darn thing which is no easy matter as RO2 attest to the AT Rifle. With the type 4 rocket launcher it is still beaten by the bazooka in utility since a bazooka is shorter which means it can easily be shoulder fired in crouch or standing position.
While the type 4 its unwieldly long at 4'10" feet even more since the IJA soldier is smaller than your average US GI (around 5'3" feet was the average according to Forrest Bryant Johnson in his book phantom warrior), the type 4 must deploy in order to fire. Also since the type 4 will be stronger than the bazooka which might take 3 rounds to destroy a type 95 in game at its strongest armour point whereas the type 4 might take 2 to kill a stuart, you can make the reload time even slower so the japanese lose that advantage.
One thing I notice is that maybe the engineers can show up for the japanese side when they defend on tank maps where they are facing US tanks. Giving them access to the lunge mines as well peppering them at the ammo refill gives the japanese universal access to the AT weaponry and restricting the AT roles to maybe one or two for the japanese team with the specific type of weapon restricted on the map so some they get access to type 97 and some type 4.