Custom Monitor Frquency Hz with DSR Factors?

Hi All, 

Just wondering if anybody has successfully been able to accomplish a non-stock , custom monitor Hz resolution accessible with DSR factors enabled. 

Apparently Nvidia disables custom resolutions when DSR factors are enabled and it is impossible or very difficult to get it to work with a custom Hz. 

I downloaded CRU to try to make a custom Hz default so Nvidia would accept it but was not able to succeed at my monitors native resolution of 4096 x 2160 42LX3QPUA. 

I looked up and down the internet for an answer and came up empty handed, wanted to see if anybody here was able to find a solution on their system. 

Thanks!