that sucks. the minis should fit in there a bit better. the jbl/selenium 2408hs are smaller drivers as well, might help with clearance on the back side.
i'm pulling my minis and selenium d2500tis out, they'll need a new home in a couple weeks if you're interested.
with idq62s and minis+d2500s, i ended up with heavy natural rolloff/valley between like 2000 and 3500. figuring how to prop up that space was a challenge. i imagine the idq8s will be a bit wider.