It's an additional component to add to your existing training to specifically increase grip strength and add some forearm mass. As far as increasing weight goes just increase weight as necessary but remember this is a marathon not a Sprint especially considering if you go too hard and mess up your hands it will affect your other training as well. Also for the two-hand plate pinch as you get heavier a good suggestion would be to put plates onto a t-bar row bar and then hold it that way.