Do vary your grip from close to wide
Do warm up before you go in for your set
Do add weight when you can do more than 8-10 with proper form
Do put pull-ups FIRST if they're your priority or you're weak at them
Do place them last if your upper body is much stronger than your lower body, or they're easy to do due to lack of bodyweight.
Don't do the Crossfit skipping method unless ALL you want is to rep out a lot without hitting any muscle fibers much at all
Don't only do regular reps, include negatives, forced, unilateral, lateral ones, alternating ones etc.
Don't Drop dead down! Resist on the way down to stimulate your muscle fibers more.
Don't round your shoulders to get up easier. If your shoulder blades separate a lot you're not doing much for your upper back PLUS it's a disadvantage position for your shoulders' integrity.
My Back Atttack program comes packed with routines for packing on dense, lean muscle mass, chiseled and defined to max.
A strong back is essential for a healthy spine, but it's also a muscle complex which flatters your silhouette: The wider the wings, the narrower the waist appears!