Meantime, as a potential idea. I am thinking I might try a pair of the EV subwoofer version which will give a little more power and more bass depth. These are the 2 versions of the EV's below, the 15" I have:
This is a screenshot of the specs from both of them, the 15" full range specs is on top, do you think the 18" Sub version might work better for me please?