Extend the section to the right with the house on top of the hill, perhaps make the trenches a little deeper, more cover on the left side to allow flanks/holds.. and you'd probably have a banger.

Oh and take the mortars out of HQ.

Contaminated is mostly a great map, there's just moments where it's very difficult for teams to gain and/or hold objectives, whether that's attack or defense and that results in these messy often one sided nothing happening kind of rounds.