The warped eye edge started to reeeeally annoy me. It bugged me that I once got it the way I wanted it, and then messed up.
I decided it wouldnt do, as I would always see that detail. So I took the helmet apart and put the faceplate in the fridge for a couple of hours (wifes giving me funny looks, lol). I then popped the lense out and removed some of the glue in the faceplate (I had to put it back in the fridge a couple of times to remove all the glue needed).
I practised with my heatgun on some plastic left from the helmet trimming, getting the feel for how it reacted to the heat. when I felt comfortable with it, I heated the warped edge and used a gloved hand and a knife to get a nice bend and good surface.
It turned out alright, and Im very happy that i did it. Phew...
So after reassembling it, its finally done, and looks like I want.