safari sensitivity

[broch]

hi guys i have been using my safari since january and most of the time it has been fine
Recently i have experienced problems on certain fields with falsing

I have my machine set at all metal with -10 to -6 discrimed out

some times its fine on auto sens.
Then on another field i have to lower the sensitivity down quiet a lot
The lowest i have had it down to is 12. Does that mean i will be missing things or is that still ok for it to work

i have a sef coil fitted. i try to clean the coil regularly and am sure the wires are tight enough

any tips or suggestions would be appreciated

thanks in advance

 

[Mtnmn]

The one thing that can give my Safari fits is underground power lines, I often have to move on until it quiets down. If you are able to get away with a sens. of 12, other than losing some depth, you should be fine.