YES!! thx. this works for me.
The sticks indeed differ from each other, but now i can run em @ their own best frequency. For now i am not tuning the voltage. Seems my 1st stick was a good one

Running 1st stick @ 600 Mhz and 2nd @ 425 Mhz looks like this is max for both.
This option is what does it for me now: --gekko-serial "GS-xxxxxxxx" running two separate instances now. Wonder if cgminer is adapted so only 1 instance is needed, based on serialnumber.
Anyway thx for the help.
+1
Even on that nice hub, keep in mind the power output will still be constrained by the power input and the shared regulators.
While the "All" option is still available near the site's page navigation, click it and search for "serial".
Well tried to search and knew there was a thread handling the serials, but could not find it anymore. I know it was a 2pac thread, but even could not find it.
My power is good, using a single rail 12v power supply. used it for older technobit miners in the past (these miners where pulling much more power), now dedicated to suppling the hub.