Manual and nulling question

[greedykind]

I am hunting over a field for the second time that i retrieved about 50 silver coins this past year in auto +3.I switched over to manual and i began finding items that i had missed, but i am getting alot of nulling.I am using the 10x 12 sef coil and was wondering if it make any sense to go over it with the 10 x 12 then the 12 x 15?Would i get more depth?And then i maybe run over it again in TTF with the larger coil.I have removed tons of junk and am running with deep off fast off.What woulb be your approach?Thanks ahead of time and good luck to all.

 

[LabradorBob]

I run lower discrimination on mine,i have the coins mode,and a mode set up with
everything 28 and below discriminated out ,and i have one TTF.
I use the one with 28 and below Masked most of the time, I dont get quite as much nulling.
if i do i slow way way down and pick through the signals.
If it is extremely trashy of course i go to ferrous.
Manual will get you more depth also, If i am hunting i try auto,but if it won't run over 20 i go to manual and slow way down.

LabradorBob