Adjusting Surefire Z41 tailcap pressure

[etc]

Is there anything I can do to lessen the pressure needed to turn on the Z41 tailcap, in the instant-on mode?

I find that it takes some pressure to activate and then to hold it turned on.

I also noticed that

I tried the Z41 with both Leef and FiveMega bodies and I find that with FiveMega, I need to exert less pressure. Both Surefire 9P body and Leef seemed to require more pressure.