So I think I have a working solution that is ideal in my case.
Building a custom profile does work but causes again a trade off on HDMI. I build a custom profile as explained here about half way down by Sparkymelb at https://forums.whirlpool.net.au/archive/1479962
I tried the custom profile before and it looked awful the trick was to switch timing from auto to CVT REDUCED BANK. This looked absolutely perfect just like with dual link dvi or DP.
YET AGAIN i get the flicker to occur just like it did with display port thats super annoying and thats when i finally (probably longer than it should have taken) to realize its a timing issue an nothing else
SO I now choose CVT option and boom problem solved. No flicker perfect image all sunshine and bunnies...until you let the display go to sleep and then on wake up it all goes to hell on the custom profile.. so I read on some more and like the OP had success by changing the refresh rate to 35hz...and boom now it really does look and work perfect....except until something moves on the screen and its at 35hz. 😕
So I went and switched back to display port hoping the 35hz to solve restart was a HDMI limitation. Now when I choose CVT option the monitor goes to hell immediately when running DP and still has flicker with CVT REDUCED BANK. so now thats out
Finally With my newfound knowledge that is timing/Hz related I removed the custom profile, ran the 2711 on DP at native 60hz 1440p and set the Predator to 165hz overclock and now I seem to be doing pretty good no known issues yet. I was worried the predator doesn't have the response time to pull 165hz but it seems to look fine... so great.
I think im set... I hope