Big search coils and beach hunting

I am always singing the praises of medium to small size search coils for beach and water hunting, but that does not mean I do not like using large search coils.
The problem is finding a large search coil that can detect large targets at depth, but still have the sensitivity to detect shallower small targets.
The NEL 15 inch attack search coil I have been testing on an Excalibur II, has good depth on large gold bands and is sensitive to small shallow targets.
It has been a while since I used a large search coil on a Minelab Excalibur that I enjoy using, many large search coils false in the wet sand and in the water.  
Using some large search coils, you have to reduce the sensitivity control to run smoothly on the lower beach, but when you reduce the sensitivity you often lose target depth and defeat the whole purpose of using a large search coil.
I am happy to say the search coil I have been testing only needs to have the sensitivity control reduced a little to run smoothly in the wet sand and in the water.
On the wet sand, the Excalibur II and 15 inch search coil runs at about the same sensitivity level as the 10 inch search coil, which is quite impressive.
This photo shows the size of jewelry you should be able to find using a large search coil at the beach if it is a good search coil, notice the small stud ear rings and the ear ring back.

How many people reading this blog find this type of small jewelry with a 10 inch search coil?
Extra large search coils are like pulse induction metal detectors at the beach, if you have the sites to use them you should do well.
I have several sites I know a 15 inch search coil and Excalibur combo will do really well, especially now I know the search coil can detect small shallow targets. 
Detecting small shallow targets may not seem like a big deal, but it is to me as I search for small 300 year old Spanish treasure coins and thin modern diamond rings. 
What use is being able to detect deep targets and cover more ground using a large search coil, if you walk straight over more valuable shallow targets. 
Trying and testing out new beach treasure hunting equipment is exactly how you find out if something is going to work out for you or not.  
If you can detect the small stuff using a large search coil, you will have no problem detecting the big stuff using the same large search coil.