[Elecraft] Not sure my KX1 ATU is working correctly

[james1787 at aol.com]

Hi Folks,
I just finished putting together my KX1 with the ATU. I am having a problem with it on 20m when using it through my shack tuner (viking matchbox to a dipole up 60-70 ft). As the manual states, I place the tuner into CAL to bypass the tuner. The problem is that it seems kind of quiet. I listen to a loud S-9 signal on my IC-746pro and it is much quieter on the KX1. For kick's I placed it in the tuner-on setting and hit tune. It tuned for a seconds and now it's louder. I tapped the key and it went back to being quiet. 
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I didn't seem to notice this on 40m last night and made a few QSO's. 
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Just wondering where I might check to see that everything is ok. I wonder if C9 on the ATU is set correctly? With my DMM I was able to get the voltage down to almost zero. 
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Thanks & 73,
James KB2FCV