Scraps (i think) elastic rope trick made my hands faster, my sparring partners noticed it first. Get some elastic rope (15mm if you can) i just double up some 8mm as i couldn't find any thicker. They sell it at boating/hardware stores and is pretty cheap. Get a couple meters of it. Then tie it at one end to a post or something similar at eye level, make sure its secure though as you don't want it to hit you in the eye, so look on the net for some good knots. Then tie a loop on the other end so that you have something that you can hold in your hand. Then get in your stance at a distance where the rope is tensioned enough for you and start jabbing. It pulls your jab out quicker making your muscles work quicker as a result. I know sprinters do similar things like this to improve acceleration and top speed so it does work. I hope that helps you mate