I own a 99 Javelin Renegade 20 FS (Javelin 409) which is a little bit heavier than yours and it may be a bit deeper as well. I run a 200 Johnson Carb and a 25P Renegade Bass prop. It came with a 23P Renegade but the RPM's were too high in my opinion. I switched to the 25P gained a few MPH and dropped the RPM's down to Johnson specs. (5000-5400) I would agree with Luke that a 23P is too small. Try a 25P 4 blade.

As for the jackplate I don't have one yet but I was told that a 6-8" is about all you want to go. You could always post this on the Setup thread and Todd Morgan from C & O would be able to tell you more. He has vast experience with Javelin's and Stratos boats.

Oh and by the way where is Minnesota City? I am up just south of Alexandria on Lake Minnewaska.