Are you straight airing? If not, you might be popping way early without realising, I remember a dude at my local park, knuckled the biggest jump like 6 times in a row before realising he was spin initiating way early and kept skimming the lip too.
If you're straight airing, then either you're to light (which I doubt, you'd be surprise how little weight effects air time) and I guess go higher, but if riders your sizes are stomping the jump fine from much lower than you then most likely you're just popping wrong (or not popping at all, even if you think you are). How many times have you hit it? If only a few, you might not have realised that you're stopping a little in the tranny, it sounds crazy but I remember watching a video of me straight airing a kicker and I pizza'd a bit right before, didn't even realise or thought I was going too fats at the time.
How to fix it:
So first thing, spot a rider your size, ask him if you can drop with him (just speed check) and see if you can keep up with him WITHOUT looking at him (as in you drop like if you were alone and stop in the tranny to see if you were able to go as fast as him). If yes then move on to second step. If no, then I guess your skis need a serious remodelling (basically reshape the bases with a pattern that makes em not completely flat, it needs to be done after like 2 season of just simple waxing, and it becomes quite obvious in slush season when you go much slower than others).
Second step: popping. You might not be popping well because it's a big jump, and you're scared of knuckling again. Just go on smaller jumps and learn how to pop again, high. (if you're having trouble clearing medium jumps at the same speed as riders your size then watch a popping tutorial, there's a few really good ones out there). Then come back to the jump and kill it.
I think it's mostly likely due to your base pattern being flat af or just not popping correctly. So don't go 50m higher.