Use a double over until you can't grip the weight then switch to a under over when you can't properly grip. Then on last set of Deadlifts hold the last rep as long as possible just to improve it more.
This is awesome advice, also get an old beach towel, and start using it for back exercises, when doing pullups throw towel over bar so you have to hang onto the towel instead of the bar. I also use it for all sorts of rowing including DB, BB, Tbar, and chest suported machine rows, I won't explain each variation, just get creative, so your having to hang onto a big bulky towel instead of bar. Also with the pullup setup, try doing timed holds. See how long you can hang onto the beach towel, and try to beat that time, each workout. This aproch has worked well for myself, and clients I trained over the years. Goodluck