You've probably already done this but. Be sure and check tvfool.com and find out where the towers are in relation to your house.
Channel 40's tower is not located anywhere near the others, making it a bit of a problem. 13 is between Cherokee and Asheville. 62 is near Hendersonville, they share a tower with MY102.5.
Channels 7, 13 & 29 are high VHF (29 is really on channel 9 now, not sure what channels their Spartanburg and Greenwood channel are on, but they're UHF). Channel 4 is UHF and is on channel 36.
16 & 21 are on 16 & 21. 40 is on 14. UNC TV is on channels 25 & 27. 62 is on 45. And if can get it channel 32 from Toccoa it is on 24.
Here in Oconee county 62 is the problem child.