I am unsure about the type 59. It isn't really all that great of a tank, it had the same nerfs as the T-54, some new weak spots put in and had it's MM changed pretty quickly.
Probably don't need any more credit making power with:
Lowe, T34, Pz38H, T14, Churchill and T-127
The Churchill is going to be an absolute monster after 7.3. The T14 even does OK. It's funny fighting Churchills and T14s in my teir 5 Hvy premiums. Most of them have no clue where to shoot. The Churchill drivers often think they can take the T14 head on, this is not the case and you just pump shells through the drivers machinegun port. Churchill vs T14 they nearly always let me get to their side and plink their engine over and over.