HI Jeff:
The F212 was derived from the F40, basically same back and sides with a more strongly braced top and of course heel block sized for the 12-string neck; 16" lower bout "F" body, arched maple back, so that'd be the most likely starting point.
F40's were revamped as the "Traditional Series" GF models in mid- 80's; offering the widest variety of body woods and back configuration ever seen on F40's (Those variations are usually seen on the related F47, also worth you investigation.)
Note they're all 16" jumbos, but sometimes the numbers give a mistaken impression about the size.
See the descriptions here:
http://www.westerlyguildguitars.com/files/88PL2.jpg
After a couple of years the GF's went away and F47 returned with several variants, and a lot of -ce "cutaway electric" models.
F40 didn't appear for most o the '90's but came back in Tacoma, with red spruce ("Adirondack") tops and bracing which is supposed to add some oomph.
LOTTA love for Tacomas 'round here:
http://www.letstalkguild.com/ltg/showthread.php?177266-Ngd-2007-f40
Then, just in case the F40's you run across still seem lacking a bit, (that 12-string top bracing might be contributing to the bass oomph) there's the
17" lower bout jumbo family starting with F50's (arched maple back) and F50r's (flat rosewood), and a blinged-down F50 known as the JF30 (also seen on that price list).
JF30 had a particularly long run extending all the way to Corona, should be pretty easy to find.
F50's morphed into JF65 and JF55(rosewood), you can see the beginnings of that process on that same price list under the "Jumbo" header.
They're essentially the same build formula with some "tweaks".
Finally, re F30's: although they're very efficient "air pumps" and the bass will be very well balanced for the instrument itself, I just have a suspicion you may find it insufficient in overall volume if you're used to the F212, since F30's are 15" lower bout size.
Re the dreadnoughts:
Be willing to consider D40's.
I used to think my D25 had better bass than my D40 (
flatback 'hog) but as the D40's opened up I realize it's just "different".
"Punchier"
I used to play what I called "cheater bass" with my '25 in jams, it has a more "stand up bass" kind of sound, but the '40 sounds more like what you'd expect from a bluegrass finger picker, and to be fair I have no clue if a D50 (flatback rosewood) might deliver even better, for your ears.