SITL, swarming: increasing stream rates per default

Good evening,

I’m trying to increase the streamrate of two messages (Attitude and Position) in the SITL by default on startup.
I failed in many different ways, so I started a thread:
Last attempt was to just to change the default params file. However the file is either not loaded or overwritten (see pic below).

So can somebody help me?
Changing the parameter in code?
Find my issue in loading the paramters?

thanks, Leo