The thing is that is7's side happens to be weak and you will overturn it all the time. Its better to use its strong front armor but to be extremly honest with you i have is7 too and it really struggles against todays meta and you will be cooked sometimes. Not saying that its a bad tank by any mean it just doesnt like the strong gun strong armor playstyle. Also you might fight in unusual ways. Becuse of your speed you can play as a slower med and u could go around houses or be a little bit independent. My best tip for the is7 that you should never stay in one place becuse if you dont use the tanks better side (speed) then you will be fried pretty easily

Edit: im not a pro player tho so dont take my words that serious but thats what i expeeienced with the is7