[Elecraft] K1 and Z match tuner questions

[rlpend]

Hello everyone,

I have a ZM-2 and a BLT tuner which I connect to an end fed wire of 33 
feet length. Most of the antenna is outside, but it is only 10 feet 
above ground. I am using an inside  counterpoise of 23 feet, mainly for 
30M and works well on 40M too. The K-1 is for 20/15M.

I notice that if I adjust either of the tuners for minimum LED 
brightness on 20M (the light does not go completely out) that the LCD 
on the K-1 shows one hatch mark when the key is closed. If I hold the 
key down and adjust the tuner without regard to the LED I can easily 
get the LCD to show 4 hatch marks.

Could it be that the Z matches are so sensitive that "LED out" means 
1:1 swr ratio and "on" means perhaps 1:1.3, etc.  and "bright" means 
anything?

Can I safely and to good effect tune the radio by hatch mark and ignore 
the LED?

Why do you suppose the K-1 and Z matches don't agree?

TNX for advice.

Bob
N5JYW
Wisconsin