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I also learned this trick, contrary to all the information written about the time involved in annealing. One of the engineers at Acylite told me about a fabricator that he knew that did a quick anneal with a heat gun. I bought a heat gun and tried it. Mind you this was 3mm acrylic, it worked. I heated it up to just before it deflected, around 180 degrees or so, just hot enough to where you can't leave your hand on it. Then let it cool down slowly. We also tried setting our heat press at its lowest setting of 200 degrees. (deflection temp is 203F) Put the acrylic in with a piece of paper, top and bottom, set to maximum time, which is 100 seconds on ours and that also worked.
With the heat gun, did you let it cool slowly with pressure applied or under it's own weight?