Well, first of all, I sort of like your unproblematic approach to the board; it looks natural.
So, let’s use the 15.25m jump in slo-mo here:
It seems you’re rushing the hop a little bit. By ‘rushing’ I mean that it seems you’re trying to be active throughout the whole phase (probably in order to avoid a speed-reducing impact). It looks to me that your over-emphasizing smoothness or speed loss.
The way you do it though, is to rotate your upper body forward, thus we’ll see over-rotation at approximately the last frames of the 0.22sec mark. It’s elevated at the 0.23sec mark. That, in turn, makes it somewhat impossible you to gain height during the step phase (which is directly translated into loss of overall distance).
What it basically means, is that your hips remains in a sort of “cup-position” like this _)_. When in fact you’d like to have a hip position like this _(_. It also means that you sink too deep during the impact (your center of gravity is too much in front of the optimal alignment and your knee angle sinks too deep therefore).
Now, if you compare your hip alignment during the impact in the hop and in the step phase (see the 0.26sec mark), you’ll notice how they are vastly different. During the hop it’s like this _)_ whereas during the step it’s like _(_. It basically means that your free leg (right leg) must first travel “downwards” before it can start traveling “upwards” and lead the whole step phase. But by then, it’s already to late.
Basically it all boils down to being slightly too late in regards to all the actions of the free-movers, throughout the jump.
From an athlete’s point of view, and probably what feeling you’re after or perceive, it seems you don’t allow yourself the time to “just let your limbs and hip do what comes naturally,”, or “just ‘allow’ the time it takes for your left leg to leave the board, come through the heel near your butt, and move ahead. You are ‘trying’ to bring it ahead when in fact it should come ahead naturally; like a released rubber band.