I've been using the 10.5" loop on my CZ-5 for years before I got my CZ-20, so when I saw a CZ-20 with a 10.5" loop on it, I snagged it right up!
On dry land (or even really shallow water, where I can see the coil easily), I use the "X" style pinpoint. I find that the oval-shaped receive coil helps in visualizing a "line" running from 12 o'clock, through the center of the coil, to 6 o'clock. When I cross the target, and it beeps, I mentally imagine that line on the ground, and turn 90 degrees and sweep that imaginary line again. When it beeps the second time, I visualize a second line, based on the coil, running at an angle to the first. Where those two lines intersect, well, basically, "X marks the spot".
In the water, I use a method I call "Bracketing". When I get a target, I pass the coil back and forth over the target, slowly, and decreasing the distance travelled with each pass. After a few seconds, I won't be able to move the coil a fraction of an inch without the detector sounding off. Once I reach this stage, I start moving the coil forwards and back, again, decreasing the distance travelled with each pass. After a few seconds, I will not be able to move the coil but a fraction of an inch in ANY direction without the coil sounding off. I then have the target "bracketted". I'll plant my coil on the bottom (often getting a bell tone), move my foot up to touch my coil, remove the coil, and place my scoop on top of my foot, with the point of the scoop just forward of my toe and angeled down.
Now, I'm a lakes and stream person. I've never hunted big surf, so I wouldn't know how to deal with that condition, but hopefully this helps you.