I have done the boiling water/ice water approach with other miniatures, namely some from Arcadia Quest and my Reaper Bones. They all seem to go back to the original bent position, even after a few times.
I'm definitely going to give the hairdryer method a try.
This is something that frustrates me so much with the pre-made models. There is absolutely no need to cut off the tabs!
I hate that it makes me waste my greenstuff. =(