Thank you for the update Lolliedieb!
Here the stats from a short term test with old cards (all with tweaked memory timings):
I've got like 20% more hashrate with my 290x/390x (Hawaii), they were at 22-26 sol/s before.
Sadly there is only like 5-10% gain (~1-2 sol/s improvement) on the even older 7970/289x (Tahiti) cards, but they still doing their job now at 18-20 sol/s

Average speed (90s): 30.5 sol/s | 29.5 sol/s | 31.2 sol/s | 20.0 sol/s | 28.6 sol/s | 19.1 sol/s | 28.9 sol/s | 19.8 sol/s | 31.1 sol/s | 18.6 sol/s Total: 257.4 sol/s
I also did try this miner with a 1080 ti but EWBF's miner is still better (same OC settings):
~62 sol/s vs. ~70 sol/s
So good job

Hope the stabilty is still as good as before (or better).
I still haven't figured out how to set the api port, tryed command line and the json file (default and coin section). Can you give an json example on how to use it?