I agree with previous comments, the mortars should have spotters or troops in contact before they can use precision strike. Not be able to randomly drop a single shell on something with such great accuracy.
I usually open with 2x MG's and move them so they can cover each other, always mutually supporting one another so the soviets cannot flank them, I support these with 2x squads of Grenadiers and make sure to Upgrade them with LMG's. The sniper works well but keep it a max range to kill shocks from afar.
I find the scout car is not much use anymore since it's nerf and the FHT is good for reinforcing troops, but I find myself being far more careful with it since the last patch.