I know its daunting looking through the 80 pages of posts. Maybe Sidehack/VH can update the first page with all the config settings cgminer now supports?

you may want to try --gekko-start-freq, I havent gone through the code on github to see if it works for terminus but it would be worth a quick try. like you said, letting it autotune is best, but this is the one your looking for: --gekko-tune-down

https://bitcointalk.org/index.php?topic=5053833.msg50506833#msg50506833

 [90-95]% is a healthy range, 95 is default, set to 0 to disable.
        1.  Adjusts frequency according to each miner's unique charateristics
        2.  To keep a hash performance above 95%.
        3.  Based on the idea that (95% of 275MHz) hashes better than (80% of 300MHz)