First ... welcome to the wonderful world of MMA
The "Silence" on the 3rd bar is just how the groove was designed. There is a nice bass note there. But, if it bothers you there are several simple solutions:
1. Use a different groove,
2. Enjoy the silence. Frankly I think it sounds just fine (but I wrote it),
3. Use a riff modification for that bar:
Groove Ballad
1 F / C
2 Dm
Chord Riff C1234
3 C
4 C7
Riff is something to apply to a SINGLE bar
4. Modify the groove itself. That, too, is easy:
Groove Ballad // load the groove to change
Chord Sequence C1234 C13 C1 C13 /// just an example, probably sounds awful
DefGroove Ballad /// now we have a new ballad groove in memory
Let us know what works.