Question: Soviet infantry bt vs. infantry/tanks

[Revenant]

Hi,

I am going to try soviet infantry battalion in a long war campaign. So far I have:

2x Infantry+ coy
Engineer coy
AO
Scouts
2xsniper
BT tank coy
3x 81 mortar platoon (6units)
2x MG platoon (4units)
3x AT platoon (6units)
off board 76 mm battery

around 2000 pts, 80x80 hexes

So far I have one battle behind me against Polish.

Now, I remember how hard it was for me to fight against Finland when I tried this campaign several years ago.

I read an excellent article by Mobhack how to fight Finns using an infantry/artillery combo. My question is just how much artillery I need for this kind of tactics using force posted above.

The second issue is anti tank ability of my force. In previous campaign, I used T34/76 tanks extensively to combat enemy tanks. I just want to use AT guns somehow, if possible. But I found it very difficult, especially in offensive missions (and meeting engagement too) as better AT guns are immovable and I have to use transports to move them, which is not very tactically sound. And I have experience that AI usually shell my stationary guns with artillery when fighting defensive missions, so they are not very usefull there too. So is the only viable possiblity to change them to SP guns/tanks later on?

Any advice welcome