Hi folks. Just wanted an quick advice. I do the Primal Fitness Blueprint and have great progressions through all exercises safe pull-ups. For example, push-ups I started at 25, now I'm at 40. The plank I could do 45 sec, now I'm at 90 sec. Pull-ups I started at 4, and can do 6 now. (The exercises below those exercises in the progression I can do completely.)

Any advice how to make more pullups? Greasing the groove, maybe? Thanks.