Don't get too complicated. you just don't need to.

I play a lot of bluegrass with group situations and country when singing solo. Needless to say, I use a lot of first position chords utuilizing strong rhythms.

Sometimes, when the stuation is right, I will sneak in a 6th chord before the fourth chord from the first chord.

In other words, if playing in A, instead of just going to D, try going to a quick G chord first.

A------G,D

Great effect.