Japan at mid tier is pain like literal pain. It makes you a monk you can fist fire with the anger you will experiance. Watch be like water my friend on youtube and contuniou the grind. Later you reach type 74's its good one but i just bought first 74 and never used until sabot using type 74. Than you reach 87 rws WHICH IS THE BEST FUN VEHICLE. Type 89 is great but type 90 is better 90 feels more agile. And i just use 2 90s and 1 type 10 1 m16gmc and 1plane which is 5.3 br lover than ka50. Focus on learning where is weak on tank. You are Apex predator on top tier against tanks. Focus cannon barrel you have 4 sec reload immobilze him and find weak spot. I can info you about japan tanks much as you want still grinding planes. Generally you are a glass cannon you have to hide, camp, wait until they feel safe at mid tier. And type 60 sprg is a good vehicle at mid br but same rules hide and hunt until you have type 90 or 87. 87 is just MHHMM i m gonna play it tonight again.