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You would be better off using the CRU (custom resolution Utility) app to alter the Freesync range. I have the same monitor and the range after the alteration is 55 - 144Hz where freesync works. The monitor OSD will still say it only works at 35 - 90Hz but it does actually still work. Not everyone can use 55Hz as the lowest range while using 144Hz as the highest range you would have to experiment.
Although for that particular game you would be lucky to get 55fps since the game doesn't run that great.
An alternate would be to setup a custom slightly lower resolution with only 90Hz defined but you wouldn't be able to use the full amount of pixels on your monitor then.
Wow, didn't know that this tool exists. It works very well. No mans sky is still stuttering like hell but Rocket League with 144Hz and freesync is really impressive. The range is 56 - 144 now. Thanks!