Warpedneck actually tells you how to fix your neck, right there on their main page! If you have multiple instruments, have patience and play the playable ones. Wait until summertime. Loosen the strings of your troubled instrument, loosen the truss rod, and put the instrument in a sealed box out in the hot sun for a full day. Bring it in, counterweight (or carefully vise) to counteract the 'trouble' region, and let it come back down to regular temperature. Keep it in its 'reforming' tools for some days.
Obviously, warpedneck will be utilizing tooling they've developed specifically for this job - so their results should be more consistent and less prone to twisting. But you might be successful doing what I just outlined.