To put some perspective into your jumping. You’re 25 and on the verge of jumping 25+ feet. Not a whole of athletes ever make it this far at this level. I really think you have a chance of making a go at 8 meters. I don’t think ramp jumping is the solution you are looking for.
How close are your practice jump distances to competition distances? I really think fransisco and mike are giving the advice you need and I think your timing would be better served with jumping at a variety of approach lengths where your speed at takeoff is varied making you more aware of time and distance (temporal-spatial awareness).