Driver recommendation for hi-fi DIY sub?

Hello.

I'm looking for driver recommendations to build 2 subs for stereo. From reading around I've narrowed it down to TC Sounds LMS-R 15" or 12" and Rythmik DS1200 and their plate amp (similar to their F12 sub), but would like to double check with you if I'm on the right track.

For context, I have B&W 804S driven by McIntosh MC275, plus a Rel Storm III sub. The Rel is nice, but can't say it's taut, articulate bass. So I'm thinking of selling it. Part of the issue is around room mode exacerbation which is mostly a placement thing, to certain extent. A DSPeaker Anti-Node 8033 is part of the system I'm thinking.
Also, reading a book by Floyd Toole, he argues for 2 subs playing the same summed-up L+R signal and placed at 25% of width on each side of the front wall to keep the first three width room modes in check, so I'm also planning two subs.

Planning to DIY, and planning sealed enclosures.

The big question is the right driver, though.

BTW, room is 3700 cu ft, and 16 ft wide x 30 ft long.

Sorry for the long preamble.

Recommendations? Thanks!