[Elecraft] Running DM780 with the K3

[pastormg2 at verizon.net]

I am currently using a signalink USB with HRD and DM780.  I have DM780 keying the K3 which is set for PTT vs VOX.  I am trying to transmit PSK31 and the mode set on the K3 is USB vs Data. Not sure if that is correct or not but when I choose the mode Data the waterfall display is super messed up. But when the mode is set to USB it looks perfectly normal.

But, when I hit the transmit button the K3 goes into transmit mode but it looks as if no power is being registered on the meters even though I have the transmit power set at 40 watts.  Am I doing something wrong?  Any help would be appreciated.  Mark KB3Z