Because its the Good Old KV-3 (i have a 70% win ratio in 47 battles - i know not a big pool to draw from but i am happy with that result given my T-54 has 5 less battles and only a 33% win ratio ~ and that is a bad tank to have losses in)

Given its now a T7 and i have both Tiger and KV-3 they are two different styles of play as a KV-3 can brawl when a in a Tiger that is a bad idea unless you significantly out mass the opponent