Soviet Shock vs OST

Pretty good game on my part boring on his, guy decided to turtle so I made 2 120mm mortars and pretty much bullied him from that point forward.

Went with engi/car opening and started capping noticed he had 2 engi so I assumed he would make 1 less gren and either PG or MG. He went for center VP and building control so I played around him and kept control of as much map as possible including both muni points. He seemed to be turtling hard so I decided to wait out for mortars.
From the moment I got mortars, he seemed to have no answer. After some poking I saw he had made a reinforcement bunker which I started bombarding and pushing and eventually got with satchel. Since He is so passive I was able to get 2nd mortar due to minimal MP bleed and finally shocks. I bully most of the map from him until he gets his 1st tank out and he starts to push. Takes me a tiny bit to get T3485 since most of my units were so expensive and I want to keep pressure on. I eventually get my tank out but nothing exciting happens.
I continue to bombard him and he doesn't adjust his gameplan, even making another reinforcement bunker outside of his gas. Deciding moment happens when we both get 3 tanks but I catch him out of position and kill all 3 despite RNG best job of having my tanks hit ground or bounce.
GG