Here's something that might help. If you feel like your ankles are bent, but your weight is back, then what you need to do (and judging from the pictures, I think you should work on) is to bring your femurs more vertical. Right now, they are angled back.
The most likely reason that you have a hard time in the bumps is your balance/stance. Once you are able to bring it forward and get your CM up over your toes, you will find that bumps get a lot easier.
However, you do seem like a fairly accomplished and aggressive skier, so give this a try. It's an exercise I use with upper level students to get them into bumps, and sometimes helps them get their weight forward as well:
Think about a diagonal traverse across a bump (start with only one bump). As you traverse over it, try to pre-jump the crest of the bump so that the middle of the skis do not touch the top of the bump. If you do it too late or from the back seat, you'll just extend and launch off the top. If you do it right, which is a forceful retraction of the legs, it will be a very quick hop over the top of the bump, and the skis will come down on the back of the bump. The idea is to drive the tips of the skis down the back of the bump, ON the snow.
Once you are able to do that, traverse a diagonal line of bumps to get the feel a bit better.
Then, just one bump, but as you drive the tips down the back, turn the skis down the hill and bring them around into a complete turn.
Then, link those together, trying to keep the speed way, way down (this is practice/learning, so don't think I'm saying that you always need to ski bumps slowly). You'll work toward a feeling like you are pre-jumping each bump, but without actually going to the extent of pulling the skis off the ground.
Then, as further practice, look for large bumps on a steep hill, that have very steep backs to them. Moving SLOWLY, do the same thing, pre-jumping the crest of the bump and driving the tips down and into a turn on the steep backside of the bump. Slow yourself way down after every bump.
To be able to pre-jump the bump without launching yourself into orbit, and being able to drive the tips down the back side of the bump, your CM will be forced to be properly positioned.
Hope this helps.