I've been beach detecting for about a year and a half. Maybe about 400 hours on the beach. Which means, there are others with much more experience than I! I recommend posting this on the CTX 3030 Forum for more feedback.
My opinions:
The Beach discrimination pattern seems to work for me, but I try open screen sometimes to test a hit. Everything I dug up anyway (when outside the discrimination pattern) has been trash (Everything!). Now I just don't dig if outside the pattern.
I sometimes change up between High Trash and Ferrous Coin settings. Strange thing that i Don't understand when on the beach, is sometimes when in High Trash, I swing test a wedding band and there is no signal. When I go to Ferrous Coin, the signal is clear. (maybe some other CTX users know why??)
Recovery fast is good if there is a lot of trash.
Also, if on dry sand (and there isn't much trash), I like to select Recovery Deep. I found not to select Recovery Deep if in the surf because these targets are just too deep for me to recover.
Seawater-on, in my opinion is a must! If not selected, I get lots of chatter and false signals. (I usually detect at Virginia Beach.)
Hope this small bit of info is useful.
Mike