MPDecision hotplug is now disabled. This initially caused a lot of lags. Franco removes these lags by using cpu boost which is a feature not available in the stock kernel. I've been able to mimic cpu boost by changing some interactive governor tunables: reducing go_hispeed_load and setting hispeed_freq to 1190MHz.
With the latest script, I was able to get 2h 45m SOT under heavy usage (battery 80% to 5%).
The attached zip is not a flashable zip. It contains the FKT script and instructions on how to use it. Please don't flash it and complain that it doesn't work.
Credits: @topjohnwu, @franciscofranco and @osm0sis