I cant help but I do have the same issue with a LG 34UC88-B; freesync was working with older drivers but I havent checked lately.
I only discovered it wasnt "supported" after doing a fresh install of windows with fall update (forced) and 17.11.1.
Disable Blur Reductio via the Monitor OSD, it is incompatible with FreeSync.
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I actually resolved my issue last night by setting the refresh rate in
windows to 75hz from 60; as soon as I did you freesync was on and that was
Odd because 60hz is in the range but just happy it's working now.
Wow, never would have thought that was the problem, but you're correct. The manual explicitly says it supports FreeSync in the range of 55-75 Hz, but setting it explicitly to 75 Hz automagically enabled it.
I love you so much.. 75hz baby