Buddy--
Per your post in the other thread, THANK YOU for your service, and I'm sorry to hear about your medical condition.
I am no expert at beach hunting, but I owned/hunted with an Explorer for years, in dirt/turf. I took my first shot at beach hunting this past fall, with an E-Trac.
Here's what I would do...
I would start out in manual sensitivity, set in the low to mid 20s.
Set your variability settting to maximum. Set your threshold pitch and volume to whatever are comfortable to your ears. Set your "max limits" setting to maximum. Set your tones to "normal" and "conductive sounds"
I would set my machine's "iron mask" to -6 (I think it's minus 6; on an Explorer SE Pro, it's 22, but the numbers were different on the SE Pro...I think it would equate to -6 on the Ex II).
I would then leave the rest of the screen, to the right of the -6 Iron Mask, wide open.
Now, hunt away. Listen to your machine -- pay attention to how "stable" it is. If it is running too "noisy" for your taste (lots of low-tone chatter due to the salty sand), you can lower your sensitivity a tad, or if you can't quiet it down, switch to manual sensitivity. But you shouldn't need to do that. Manual, low to mid 20s, should do, unless your sand has alot of mineral/magnetite.
Gold can hit virtually anywhere on the screen, conductive numbers 01 or 02 all the way up to the mid to upper 20s. Most women's wedding bands will ring up with ferrous numbers roughly 08-13, and conductive numbers in the single digits. Many others will hit in the low to mid teens, but so will many pull tabs. Men's gold wedding bands will often hit in the upper teens, conductive. My personal ring hits 08-19. My wife's is like 11-05. Dig anything repeatable/consistent.
Hope this helps.
Steve