Can you show photos of how you placed the spacer underneath the latching bracket to raise it up? I'm not seeing how this is possible. What kind of spacer did you use to raise it up?I installed the chair tips on the 4 posts of the moveable plastic frame, not on the rubber seat buttons. I fiddled around with different shim heights (felt chair leg pads) between the rubber tips. IOW, put a washer of felt in the rubber tip before sliding it on the post.
The thinking was that with differential shim heights I could dial in tilt as well as height.
IIRC, I did have to put a spacer under the metal latch bracket on the bottom of the seat to allow the latch to engage the now-farther-away seat.
For all that fiddling, I eventually went with the original seat mod (with the different sized bumpers), and I've since bought a Sargent seat, which I'm also not crazy about.
Making my butt happy has been the biggest struggle with this bike.
I really like your idea with using the rubber tips from chairs and putting felt pads inside to ship them up.