Sorry, recently switched internet and am having issues...I don't know anything about grounding or SWR but, I did ground as soon as I had it installed. Also, because I have an aftermarket stereo with Bluetooth and stuff, I was getting some interferance using the CB. I got a 95% sheilded cable rather than the normal CB cable and seems good now.
The ground wire to the mount is actually part of the mount. I did it only so I could take the antenna off easier if I had to. 1 wire to the mount, 1 from the mount into my tail light ground