Hey Nick,
If you're hunting in a trashy park environment (my specialty...LOL), I'd recommend switching to Conductive sounds, and using a little bit of iron mask, like Bryce recommended. At a typical trashy park, aluminum(screw caps, ring tabs, pulltabs, beaver-tails, foil, can slaw, etc) is your nemesis. In Ferrous, some aluminum will give a good tone, or a tone close to that of deep copper and silver. In conductive, all the aluminum, except for screw-caps will give a nice, lower tone, allowing you to cherry pick those deeper, higher tones amongst the sea of trash in those parks.
With the 8" coil, you can bump the sensitivity up a little bit more than on the standard coil....28-30 should be fine. I prefer DEEP off also. When DEEP is on, it slows the processing of the SE too much for my liking. I don't like the delayed responses on deep targets. Besides, you're using a high gain, so having DEEP on is useless in higher gain settings, IMHO.
Good luck!! Don't let Ron dig all the oldies out of those Sac. parks.
HH,
CAPTN SE
Dan