Interesting. My first Topre was a FC660C, but I put it aside because I didn't like the keycaps, and the layout wasn't quite what I was looking for.
Many keyboards later, I finally got a HHKB Pro 2; I liked this much better than the FC660C, primarily because of the form factor and great layout.
Recently, I decided to try a RF 87u 55g. I really like it, but for the first time in my life, I developed wrist pain after using this board. Although the problem might be due to the heavier 55g switch, I attribute it to the hard landing with the plate-mounted Topre switches. The HHKB Pro 2 has case-mounted switches, providing a more yielding landing when bottoming out.
Having started with IBM buckling spring switches, which I still use in my keyboard rotations, I tend to bottom out with every keystroke on any keyboard that I use.
Now that I am paying more attention to proper typing posture (keeping my wrists elevated and straight while typing), the pain has subsided, and I am enjoying the RF 87u more and more. Although I prefer the 60% form factor and layout of the HHKB, the RF feels like a higher-quality product.
Within the last few days, I have tried the CM Novatouch with 45g Topre switches equipped with Cherry mx stems. It is somewhat too light for me, and I prefer the typing experience of the RF 87u 55g or the HHKB Pro 2, even though the latter board also has 45g Topre switches. Here again, the RF sounds and feels like a higher-quality product to me.
I understand what you are saying about the abrupt landing with plate-mounted Topre switches, such as found in the FC660C and the RF 87u. However, I didn't notice this effect with the CM Novatouch. The greatest contrast is found with the HHKB Pro 2; I think that its case-mounted switches are much more yielding, providing a cushioning effect when bottoming out.
