Settings for radio station output

Hi guys
Have just added this little beauty to our radio station output. The compression is making us sound pretty good, but I was wondering if anyone could recommend what to do in general with those settings.

Is 4:1 about right for compression? Or should I go higher and use the knee feature?

Is it worth turning on the Expander/Gate?

Is that Limiter set correctly?

It’s only on FM in Cornwall, but you can also listen in at