I completely agree that paper wise its fantastic. The gun reloads very quickly but still does tons of damage to other tier 4's.
But for some reason I can't see to freaking win in it. Soviet cloaking technology doesn't seem to work on the 85b for me.
I use binocs and a net with it, but I don't rely on them. In my experience no vehicle's camo is reliable enough to, er, rely on it.
Say I'm on Erlenberg, west side. I will immediately cross the south bridge with as many others as have the balls to do so, and will move to K7 or K8 where there is a ridge and some foliage. I will wait there until an enemy shows up at the corner/ridge, or until allies start to move past my position. Normally I get a kill or at least some damage off of some blundering scout or medium, unless several of them come that way, then I normally get a couple kills or assists in that spot. Then I may move to about H9 or G0, depending on where the enemy seems to have dug in. As I move along I stop in good vantage points for long enough for my binos to deploy, then move on if I don't see anything after a few seconds. Whenever enemies are spotted I keep shooting until they're dead or have run off, then I immediately continue advancing to my next vantage point. But in general, I rely on killing them when they can't do anything about me, not invisitanking. Whether my teammates are drawing aggro or my binocs are spotting them before they can see me, I always get a free shot in, and the second (killing) shot comes before their gun has time to zero in.
Since your issue is winning, I would focus on being more aggressive so you can get your kills before
before your idiot teammates throw themselves into interlocking fire. Keep moving up your flank (utilizing terrain, of course) until you can spot and kill something, even if you are taking the lead with your 260hp open topped TD. In this case, it doesn't matter how fragile you are unless your opponent can survive 3 hits, or you're outnumbered. But if you do push up to a good spot, pop your binos and net, and see 3 m2s and a kv1, just wait. Without fail, at least one guy will open up on them as soon as they are spotted. Whether the enemy scatters or shoots at him, you're free to at least kill an m2 or take 50% off of the kv1 before you have to reverse into cover. When you take your shots, keep the sight unzoomed enough that you can see all the enemies' turrets, and keep firing until one of them points at you. When you reverse, zoom out into 3rd person so you can tell if they're trying to rush you, are turning to engage something else, or are continuing to watch your old spot. If they do either of the first two, just pop back out and put another round or two into them before they can settle their sights on you. It's risky, but so is leaving the match in the hands of your teammates, and it's not like you're going to lose credits on the match either way.