[DanV]

If you are patient at editing - sometimes the best thing to do is automate volume and de-ess manually. I'm not sure if sonar can do vst plug-ins - but i believe there is a freeware fxpansion converterif not? Look into the digitalfishphones.com stuff - they have a decent freeware de-esser called spitfish.

Aside from this you can try to eq out trouble spots.
You could also hunt for a better mic - or mic position.
Having the right chain before going to hd can be a big help.

What is your front end like?