I see it like $40, a screwdriver, 10-15 minutes, boom it's sorted. It's not like the old style isn't great. The MPD's all have real MPC 2000/XL/4000/2500/5000 pads in them. Identical. The sensor sheet is the same, but they lost their minds and left a gap between the sensor sheet and the bottom of the pad sheet.
They did this on the MPD 16/24/32/26/18, and every MPK they've made. Just impossibly stupid. Like if you take the bottom off an MPD and still have it plugged in (I don't recommend it, but I did it anyway..

) and you push down on the top casing, they work perfect. Because the gap isn't there anymore.
So you have to close the gap permanently. At first I used stacks of stickers under the pads, (Pound A Problem's fix I think from years ago on this forum). It was better but not optimum. Some people used electrical black tape too.
A member here, Nym to fix his gap in the MPC 1000 used a $5 drying silicone solution (same issue as MPD/MPK but not as bad. You have 1000 pads in the MPK so you already know the extent of the issue).
Run a search with Nym+silicone and you'll probably find the brand even in the threads.
So $5 or $40 you can fix it.