It's a Prestige neck from 2003, one-way truss. I'm told the bow is high starting at the1st fret (which needs a slight bit of leveling), sloping upwards to the 3rd, and a near perfect gradual curve back down to about the 15th. Not sure the exact apex height, but I should get that with the PLEK info Monday.
I had noticed the bow back when I glued the board down, but rookie mistake, I thought that was normal and that string tension would help, because the neck was perfectly flat when I glued the board down. Truss rod was completely loose, however. As for the fret tangs being too wide, they were Dunlop 6150's (.020 TW) and LMI slotted board (.023 slots), and all went in fairly easily - but I guess it's entirely possible that the board is adding to the back bow.
Also, Setch pointed out when I questioned the bowing after gluing the board down that I probably intruduced the bowing during glue up - using waterbased glue and/or not clamping the neck and fretboard to a deadstraight caul during the gluing. This was seconded today after talking to a local seasoned luthier, Randy Wood (randywoodguitars.com).
Anyways, Randy thinks he can heat set the neck back to where it is supposed to be. At this point, I guess I have nothing to loose in trying it. Hopefully I can save the fretboard and inlays in the process... If not, I'll have to find a replacement neck and bolt it on as is. Feeling a bit gun shy about doing another fretboard for a while.