Can't Engage Forward Thrust After Reverse Thrust Engaged with Saitek Throttle Quadrant

To apply reverse thrust to my PMDG 737NGX with my Saitek throttle quadrant, I have assigned switch 21 (which is the position below zero in the red zone of the left outside black lever). In the settings, repeat is maxed out to the right.

I lever works fine for positive thrust, however, as soon as I engage the reverse thrust, buy dropping the lever into the red zone (trigger switch 21), I am no longer able to regain positive thrust with the lever. The lever moves freely, but there is no action on the PMDG's thrust levers. The only way I am able to have them move forward is to use F3. 

This is annoying. I'm guessing I don't have my throttle quadrant setup properly. Is anyone able to help me regain positive thrust with the lever after the reverse thrust is engaged without having to rely on F3, rather just by moving the lever forward (which would be expected).