I don't have a CTX nor ATX, but I was in a similar predicament using the Garrett Infinium on the the beach. I now much prefer the Explorer FBS setup with decent tones and ID's for targets, and decent discrimination on hand. It was a bit frustrating with the PI picking up all sorts of junk, lots of very small bits of wire, bobby pins etc, sometimes at ridiculous depths, with only a few good finds in between.
The infinium would go very deep, but so much wasted time picking out out the good from the bad, sometimes PI depth isn't be all, end all.
Now I have the Explorer, I dig barely any iron, just the odd bottle cap or piece of aluminium, with a substantial improvment on good finds to junk ratio. Depth is also excellent, I have dug some very deep 50c pieces, deep enough to leave a crater on the beach trying to reach them.
The Infinium meanwhile has been gathering dust, so I think you will find using an FBS/FBS2 detector more to your liking, just as I have experienced.