Leveling tank from uneven floor

[Sasq40]

I do have 2 joists setup and post under the tank since it runs with the joist, also sistered all the joists in that area tanks a 160.im leary with cranking those up Incase it affects other things in the house. Was looking at those ez shims as they seem to be pretty heavy duty. Would just need to make a flat shim to go across the front were the angled shims don't hit.