You may want to try creating right-hand exercises that mimic the patterns in the piece and play them without using the left hand, just to get the right hand to "automate" them. This sort of study works for many techniques, including scales. I'm not familiar with the piece, but see if you can work out just the right hand, and then practice that slowly, increasing tempo little by little over a few days.
Lester Devoe Flamenco Negra
Lester Devoe Flamenco Blanca
Aparicio Flamenco Blanca with RMC pickup
Bartolex 7-string with RMC pickup
Giannini 7-string with Shadow pickup
Sal Pace 7-string archtop