Guys before trying it on your Pro Jumps (and mine are normal ones) you must be able to do it on the floor first. When I learnt it on Pro Jumps I could front flip easily on my feet and got it fairly easily on my Pro Jumps. I was able to adapt the right technique from the floor to my Pro Jumps.
If you learn it straight away on your Pro Jumps with no previous experience then it is likely you will develop a bad technique, which may be fine to start with but very hard to get out of later.
Also practicing loads on the floor gives you aerial awareness so you can feel where you are in the air and you know when to untuck. A lot of the problem on Pro Jumps is people are scared and untuck straight away, with good aerial awareness you know exactly when to untuck!
Hope this helps!