I finally glued the o8p on my backup AJH TMXi Pro (headsize: 160x152). Glue is rev no.3
The o8p weighs in at 51g. Keep in mind that I cut the rubber a big bigger, like 1mm. Still, in comparison to my main setup with o7p (same glue used and the sheet is also cut bigger), the o8p weights about 4g...