Okay, sorry for all the confusion let me explain a few things in correct order because I have now run a lot of benchmark tests.
1. I reverted to the magic lantern version I used before with 192MHz. Results in 59,15MB/s with Apr27 build

2. I updated back to Sep15 the newest build @240MHz with 19.95MB/s and my fault in the morning was when changing sdcard frequency I havent rebooted but now after the reboot 192MHz works as before with 59.x-ish MB/s so sorry for the confusion

3. I then switch the sd_uhs.mo danne suggested with the 104 patch and voila now I get 67.3MB/s @240MHz

4. Lastly I tried out at least to my knowledge the 16:9 mode with highest pixels out 2.5k without frtp at 16.9 maximum resolution which is I think 2512px wide and 1400-is height. The setting was on purpose a touch overexposed (f-stop down no nd filter on) and with 14bit it worked only for a couple of seconds but with 12bit it was already pretty stable (!)

If a mod can help out please resize the images or tell me what I need to add so I can make them smaller

All in all thanks a lot to all of you guys! Impressive to get almost another 10MB/s