Here's how I ran my machine:
Coil - 6"x10" DD Eclipse
Gain - Anything from preset up to max, depending on the ground
Disc - Mostly ran at 0
Grnd - Kept on Ground
Trigger forward
Threshold about 12 o'clock
I didn't see anyone running a large coil in that hot soil, there may have been, but I didn't see them. The trick is to GO SLOW! And like Horsesoldier said, dig everything. Last year the ground was hotter over on Brandy Rock Farm and bullets all read as Hot Rock, this year the ground was milder and for me all bullets read in the 20's and the VDI bounced around.
Last year the ground ran in the 70's & 80's, and you'll find you won't be able to keep the machine stable if you run the gain too high - preset was about the norm last year. This year, with the exception of one field I was in, everything was in the low to mid-60's, and the machine would tolerate + gains and still be stable.
Here's the best advice I can offer - start out by digging absolutely every beep, click and nulled threshold and take note what you heard & what VDI you got versus what you found. Then you can start to cherrypick a little if you care to. But remember, you can never be sure you aren't passing up one of those "finds of a lifetime" if you cherrypick......especially in hot ground. And listen for those faint deep signals!