Touchpad not clickable after shell swap

I bought this Luna shell and this bottom shell for my BDM-010. Swap was easy following the video guide and I'm happy of how my controller look and feel in hands compared to the original shell which was creaky as hell.

I have a quite big problem though - the touchpad registers touch but it is not clicky as I would expect when the controller is assembled. I can click it without the bottom shell, but with the shell and screws screwed in it is much harder to push, often not clickable at all. I have another BDM-060 controller in it's original shell and I can clearly feel and see a difference.

I tried disassembling and assembling again the whole controller. It is better a bit, but far from my expectation. I tried even with the original bottom shell - touchpad was completely stiff.

Extremerate, please advise what can we do with such case.