Bisonte in tier 8-9-10 battles?

Hello.

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So, basically, when I play the Bisonte, I feel the absolute king of tier 8 (and of course 6 and 7 as well) battles. No problem there, can easily do 2500-3000 damage in a blink (which is good for my standards).

In tier 8, things get more interesting and challenging (because blasting tier 6 and 7s is stupid easy and makes no sense). I can pen almost everything with AP (I almost never fire gold with the Bisonte), and be competitive, and do 2-3K damage average (I know, its not high, but my average with tier 8 heavies/mediums is 2K, so if we compare, I do pretty acceptable with the Bisonte).

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Now… against tier 9 and 10… Im rekt. I simply cant play aggresive, at all. Cant flank, cant snipe, cant do anything. Just did a battle 400 damage in Overlord. Didnt went to the beach since I guess I would die in less than a minute. I tried to play middle/medium zone, trying to support tier 9-10 meds. It was a miserable failure. But to be honest, all my battles with the Bisonte against higher tiers are a miserable failure. I played the 10001P, IS3-A, STA-1, caewrnarvon, to name a few, all tier 8 (heavies and meds) and while I struggle playing against tier 10 tanks, I at least can do something before dying. But I cant with the Bisonte, AT ALL.

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Any help? How do you play the Bisonte against higher tiers? Thanks for any tips