I get what you're saying, I really do. Looking for triggers to help me get there...
This is sometimes called "pulling the feet back", but that trigger doesn't work as well for me as "stopping the skis," even though the effect is probably the same.
This came from my experience skiing with nolo's group at ESA '05 at Big Sky. She guided them in riding up the back side of a mogul, "pulling the skis back" at the top, and then pressing them into the trough. This worked well for her group and has worked well for me as I've taught bump clinics. One drill to get this sense is what nolo called "the Waltz". This drill creates a "W" track on the snow. On a groomed blue, us a bullfighter stance to aim your skis downhill. Turn them directly uphill, then allow them so slide backwards while turning the tips back downhill again. The tails start at the top of the left arm of the "W", the tips form the middle point, and the tails again form the right arm of the "W". Once you get to that right arm, allow the skis to move downhill again, and form the "W" going the other direction. This gives a great set of sensations to seek in the bumps and in terrain such as you were skiing near the bottom of Baldy Chair.