The only thing I have to add to all these great comments is group hunting is far different from the relaxed, solo, slow hunts where we can afford to take as much time as we like before we run out of ground to hunt at the site. In a group hunt, the real estate can be crowded and disappear fast. As such, it's important to cover ground faster than you normally would to give you the edge. And since you're armed with the Deus--the fastest machine in town, it might be advisable to avoid iffy targets at first and just keep moving until you hear the obvious sweet sound you're looking for. I'm simply saying give yourself an edge. At your site if the desirable targets are silver, I, myself would be hunting in 12K with the 11X13 you have (for faster coverage) and listen for high-toned and not too shallow targets--although not silver, you can also dig those tokens at depth--listen for the roundness, skip the xy screen unless you have to use it, and consider depth before you dig. Depending on the size of the lot, sample more than one area in a short time to see if you can locate the hotspot. I don't know what your site conditions were, but regardless, after a few digs, you'll get a sense of the site conditions, what depth the silver would be, how much iron and trash, etc.; you know the drill as well as anyone here. Once you have a sense of the site, you can decide on the right coil, discrimination, etc.
In your situation, I advocate 12K in full tones because it'll hit the low and high conductors well (as you well know), but also enables you to flip over to 4K for bottlecap and other iron rejection and conductive coin confirmation. 12K really sings on US silver and in most cases less prone to EMI and Garrett Propointer interference. Yours was a competition hunt of sorts, consequently you don't need to hear every tiny bit of metal in the ground on your first pass; therefore your discrimination setting doesn't need to be low; I would imagine 6-10 would be plenty good. If you don't want to waste your time listening for and digging junk, notch out the lower end and extreme high end of the spectrum. Also, turn off Iron Volume--it sounds as if you wouldn't need it at that hunt. Most often Reactivity of 2 works really well and gets a lot of depth. Unless you're in a lot of trash, there's no need to go to 3 on your first pass. Silencer at -1 or 0 unless the site demands more...but you can hear junk and keep moving rather than sacrifice sound quality with increased silencer. I've read time and again how TX doesn't give you much more depth. In fact using TX-1 doesn't make you lose much depth either, and it'll allow the Deus to do its job quickly and precisely without the annoyance of return signals confusing the Deus because you put too much power into the ground. With React 2, Silencer -1 or 0, TX-1 in 12K you should be able to easily hit a silver dime in average soil/trash/iron conditions at 6-8 or more inches. Make sure you can hear it...ensure headphone volume is up and increase Audio Response if you're having trouble hearing the deep tones. That's how I would proceed, but you know your site better than anyone. I've been using the Deus 3-4 times a week since May and it took awhile, but I settled on a program that just feels right to me for the soil, iron and trash conditions around here. It allows me to move quickly, listen for the good stuff, check for the bad in a different/adjacent frequency and make a dig/no dig decision. I can then go back over the site again with a faster program and be a little more thorough.
Like CZ said, you're the Studmaster General of finds this year, so don't take a bad day too hard--we all have them! Good luck next time!