There are spots where it's still buggy, especially on the southern end of the county. I get decent coverage on my 396XT with stubby antenna while in China Grove and Landis, & some spots in Kannapolis. There was an article in the Salisbury Post today where they've finished construction on the southern tower for the system, which is behind Station 82 on Hwy 152 West, just a few miles from China Grove. This will provide ample coverage for China Grove, Landis, Atwell, Enochville, West Rowan (into Mooresville), etc.
Once the VIPER tower on Catfish Rd is finished in High Rock area (Pooletown, Richfield, etc) and the county co-locates on that tower it will give superb coverage for the P-25 system. The two sites active right now are Al's Knob in Granite Quarry, which was the original tower site for the analog system in 1989, and the other site is on Young's Mountain in Cleveland (western Rowan County).
I'd leave your settings as is for now. It's going to get better soon.