Pinpoint vs All Metal (autotune) on the CZ21

I just did an air test today to figure this out as someone on the forums said they were considering hunting in pinpoint. Here is what I found on my air test with a quarter:

- PinPoint I can only airtest at around 7 inches.
- Autotune my faint signal dies off at 13 inches.
- Disc I can get around 11 inches.

So pinpoint was significantly less deep. Also, the halo around the coilwas  much smaller in pp. I have to get under the coil to hear it whereas in autotune I can be on the edge or just outside the coil to hear the target.