Right Dave I'm gonna be brutal here, no sugar coating..
1. Get off the gravel. Chuck the mat on top of your car and drive it to a park if you need to. Ideally, have a tarmac/concrete approach and put the mat on some grass.
You will almost never learn to land a front flip from bouncing in front of the mat like that.
2. You NEED an approach. The momentum of starting back 12 feet or so will actually help your rotation. It can also cause you to travel and miss the whole mat so take it easy, one little bit at a time.
3. The flip at 0:48 is the cleanest there. As Snud says, your arms are critical. Dont ever open the tuck. Ever.
On a couple of them your head turns to the side as you look for the floor. This causes a shoulder to drop and is a MAJOR problem when you get close to landing them. Dont look to the side, dont look for the floor. It's always there, don't worry
4. Flipping well done mate. Fantastic to see