IPR for Dark Triangles? (Photo)

I am currently undergoing Invisalign treatment and will be going through refinements soon. I have dark triangles on my bottom teeth and upper 2 teeth and I would prefer not to do IPR, but is there another alternative? My main concern is that I spit out saliva while talking and have food stuck between my 2 upper teeth. Is there another way to fix this other than IPR? Will the refinements without IPR be enough to eliminate the concerns & dark triangles?