I already tried factory reset with no success...but
I just installed a new ROM Omega v21 and turned off the auto screen on feature, installed many apps, watch styler and 20 watch faces, notification enabled for 10 apps aprox, currently I had 88% battery after 5 hours of heavy use!
The watch updated automatically, but I had to reinstall all apps, including calcs, games, calendar, todo list, cnn, appy geek, chaos control, gear chess, google tasks, timer, news republic, daily expense, simple calc, news reader, my notes, just write and easyly Do, matrix clock, etc...
Maybe I found a cure for my case....
Galaxy note 3 + Gear 2 Neo