Next time round. clamp the neck along the centre line, About every 35mm if you can. Then wrap the neck tightly in heavy rubber banding or surgical tubing.
Like post No. 19 in this thread http://projectguitar.ibforums.com/index.ph...15&start=15
Ive been using this method for years, Havent had gaps along a board since i began using it
I use register pins in the last fret slot and under where the nut will be, then I put my radius block on top of the fret board and then clamp it down never any problems.