Powerflex again.

Have fitted the upper torque bar powerflex bush. Great, much better in selecting gears and engine feels solid.

Can I use in conjunction with this Ktec's lower engine stabiliser mount (dogbone) with what I have just fitted. Or will there be issues? I accept more cockpit vibrations.
 
You can fit these in conjunction with the Vibra-Technics/Ktec mounts. There won't be any issues but as you point out you will experience more vibrations in the cabin but this does settle slightly as they bed in.