yep. all that. sometimes you have to experiment with boards. i have a couple of 65-70 yurchenko vaulters. 2 springs in the front-1 center-2 rear. i have another same weight. very fast and strong. 3 in the front-1center-2 rear. incidentally, these 2 spring configurations are the only 2 allowed at the elite level.
Due to the insurance problems we have not been given permission to use the beatboard with the amount of springs we would like. Any other coaches had this problem? I suppose we could just go ahead and use beatboard the way we want, however we are concerned about the liability if someone was injured and they claimed it was because we were using an incorrect number of springs.
yep...that gymnova board sucks with 3 in the front. that is really a set up for the men. and you can always find an 'expert' that can refute the claim of the manufacturer. don't be concerned with the liability. remember the issue at Worlds? they stopped the event, had a meeting and brought in different boards. the board they were complaining about was the gymnova with 3 in the front.
Yurchenkos take a long time to perfect. It is important to be consistent on the entry before pushing the vault too hard. I feel sometimes this step is getting rushed now moving kids from L7 to L8. Removing a spring isn't a magic fix, but it can help the kid get more from the board if they can't hit a loaded board. On the other hand the harder they can hit the board and the more springs is better...make sense? But if they get nothing out of it that isn't helpful and they lose momentum. 65lbs is really light, to hit the same board someone 100 or 120 lbs can use......
.....So basically what I'm trying to say is just putting in the springs isn't a quick fix (they have to be able to use the board), and removing them can also help but usually there are other errors in timing or a lack of speed/power from the run and the performance of the roundoff entry.