[Elecraft] K3: recommendations wanted for NR setting

I just completed K3 1162 and am interested in setting its NR to an optimal value for combating summer QRN. I am currently using F 1--4 with some success, but would like to hear about the settings others prefer. Any other advice on other ways to reduce QRN and back ground noise with K3 features

[Elecraft] K3: serial #1162

Ordered: February 13 (kit) Katiegram: June 24 Delivery: July 1 It spent four days at an UPS distribution center near Chicago for adverse weather conditions. To repeat the mantra, Now the fun begins. I've just finished building the LP-PAN, now I need to build the kit to which it interfaces.