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The heat should do the trick but if you strip the torx head you can carefully cut a notch across the head of the screw so that a regular screwdriver fits and try it again.
(try a dremel with the little cutting wheel)
Either way the downward pressure is important.
FYI torx bits wear out after use, you might try grinding a little bit off the tip of the bit so you are getting a better bite on the screw...I have been using the same husky set for a few years now, I have had to grind the bits down a few times to get some bite back.
This will certainly help if there is movement between the bit ans screw head.