RE: tan line. I'm wondering if after removing the pg and the line is there, if you played it outside a moderate amount if the top shades would even out, or if both would grow darker with the line remaining (only darker). I'm sure a 2010 would have a definite tan line.
RE: blow dryer heat. As long as you keep it on low and not directly against it it won't cause any problems of drying out or cracking the body. It only took me about 5-7 minutes to remove my pg, and you're not going to dry out your guitar in that amount of time. I would caution as one person did on the Youtube video I saw, about not blowing to much toward the bridge, and also loosening the strings to prevent the POSSIBILITY of the bridge loosening. I changed my strings and did a total clean up (not that it needed it, but thought I would while I was at it) when I remove my pg. That way the strings were removed. I've been playing a year since, and everything is fine and dandy.