Matt , Try them without the back panels on . A kind of folded baffle .
I'm using mine like this and they're in the corners of a large bay , similar to alcoves , and I thought there was a big improvement over the standard sealed cab .
I have also read lots about how the Lancastwer cabinet isn't very good.
I bought a mintish pair with 12" monitor golds which replaced SBLs and they sound fantastic. Intrigued as to how much better they could be with "proper cabinets".