I don't think the wiring is the problem but the wiring possiblities are there.
But after enough messing around we will see what happens.
I use a sealer called draftstop that is a removeable type of silicon like sealer that comes in a tube..
Once it dries you can remove it at a later date to move the baffle.
I like the baffle in the 10 DB about 1 1/2 from the bottom I just have to throw more power to it.
you have good ideas and help here so don't give up. If all else fails and the box is good its the driver.
( meaning that driver is not suited for the box)
check out the Dayton series II in a 12" specs
http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=295-120I think that this is the driver that Decware uses in its HT 12 DB
this is not an expensive driver but Decwares pick for marketing and they stand behind there stuff.
Having said that, too bad you can't use a WO