i don`t know if my English is good enough to understand what happened. Is the warp in your diy- baffles or in the tweeter- horns?
Or is there a gap in the baffle which also results a broken horn?
When the warp is in the baffles i expect you used massive wood. Massive wooden platters have lots of problems regarding changing humidity in the room and also regarding changing temperatures, this also depends on the thickness, the type of wood, how and to which percentage it was dried and also to the structure of the platter. There are a few quality- dried hard- woods you can use, every other massive wooden platter will not stay flat over the time without supporting techniques. I think the best possibility to get competent help with your baffle- problem is to ask Tony: http://www.audiospecialtiesofnm.com
He is a specialist in massive wood and also manufactures beautiful hardwood- baffles for Prometheus.
Important:
Please remove the widebands as soon as possible from your baffles to avoid that the baskets of the drivers (they follow the wood) become oval which results a defect!
Regards
Robert Bastani