I'm no backhand expert (nor FH...) but it looks like you're doing most of the work with your arm, very little body involvement. More hip/waist rotation in your run up and follow through, used properly, could add a lot to your throw.
Not much follow through either, but I think with the added body movement and inertia more of a follow through may come naturally.
Fade Tournament Bag
3-"Max D" drivers | 4-Fairway drivers | 3-Midrange | 2-Putters
Experiments- San Marino Roc, Pearl, Cannon