also going to a sealed design would help even more.
if you go with 6 cubic feet for each cab and run a total of 1200 watts, you will be shooting just over xmax by a few mm, which is ok.
they will not have that big hump and should get you over full reference spl in room. room gain starts kicking in for a medium room around 25-30hz, so the real response will be much flatter than the model. ignore everything over 80hz.