I'm currently using
https://forums.oneplus.com/threads/rom-10-0-op3-3t-paranoid-android-quartz.1216947/
its close to the feel i get of Oxygen OS and the most stable Android 10 of OnePlus 3/3T,
If your getting Bad Screen on time (SOT) on the one your currently using,
may i suggest you try AccuBattery and montior the real culprit, as in my currecnt custom ROM it seems my battery is at fault, after one more week of testing i might switch to OxygenOS again to re-check my battery life. and then compare the results of both custom and stock.,
sometimes custom rom/kernals are configured to use alot of power to give you the performance bosst require for old phones.
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