I know this maybe a temporary fix, or might not work at all, but I'm trying it anyways since I don't have money to buy a new neck. And if I have to buy a new neck anyway, might as well give it a try.
Anyway I bought a MIM 70'ish block inlay, bounded, bullet truss rod from stratospher ebay a few years back. It's relief at about 1mm has always been a little much for me. I tried washers and it helped a little, but not much.
I live in Japan and since they don't have central heating in houses, people use a table covered with a blanket and a heater inside to keep warm. Similar to this
I have my necked clamped with a back bow hanging under the table as close as I can get it to the heater. It's about 120 degrees on the surface of the neck.
How long should I keep it under there? I was thinking about a month since it will probably be warm enough to not have to use the table anymore. We usually leave it on 24 hours a day. Anything I should look for to know that it's done. And should I tighten the truss rod after it's cooled down still clamped, or slowly tighten for how ever long it's under there?