I'm having a hard time trying to visualize your setup, if you took a picture that'd help out a lot. Sealing off the area completely would make things worse. There's a ton of factors involved with subwoofer placement, but I can tell you a loading wall on the sub facing the cabin would help a ton. If you want more output you should consider building a ported enclosure. If you give me more details I can tell you how to build the enclosure and probably could get that other sub to fit facing the bow, although some subs are well suited for a ported enclosure and you didn't say which subs you have.
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