Hey Gerald,
couldnt agree more.
I did try a few plates too, ranging from Allflex, SG, Vist and finally landed on Sinline. Maybe not as extensive as you did, but I ended up with the same conclusion.
I really like the original sinline plate and I chose it for daily driver. Gives enough stability and grip when compared too allflex, without the brick weight that you get out of allflex (at least in longitudinal).
I did try the world cup sinline, but deemed it a touch too heavy for daily driver.
if anybody is thinking an allflex insert pattern plate for carving, look no further - Sinline is your port of call.
Also riding M stiffness at 80 kgs.
Cheers