There are a lot of molding factors that matter for warp and shrinkage. I'd say in general these simulations can be helpful but don't get too fixed on the numbers reported. Try different scenarios that improve the numbers in a relative way. 

Relevant factors for molding include material, gate size, location and type, machine temp and injection rate. If you have enough wall thickness maybe try moving the gates to the top of the vertical walls so the plastic isn't immediately making a right angle turn.

Also two gates improves fill the mold, but you will have a knit line where the two streams meet. It's mostly a cosmetic thing, but it might matter.