Signalink usb tx control is "touchy"

Hello to all ft 8 users.

Has anyone had experience with a signalink usb that is erratic? Also I'm using a Yaesu ft 450d and while I can keep the alc low on 20 for
other bands ie. 30m it can't be lowered. Mostly I am on 20m where I have had some success but still not sure I'm putting a quality signal or getting the full benefit of this new mode.

Tnx and 73,

Ed, W8EO
EL96