well-frankly-I can't see much of anything on larger prints because they don't stick long enough to get a reasonable test. I definitely saw raising in one that "stuck" for a while. but I can certainly see where warp should be an issue as you mention.
I am a bit surprised that a much thicker block is not used for the bed (I think the creality is about 3/16". So I am considering replacing the bed with something a lot thicker and perhaps a broader heater to distribute the heat faster-but I will probably try a simple glass bed first simply because warpage should be less.
My only goal is to get "reasonable" runs with a cheap printer like this one-once I have it done for checking fit etc I would typically send the CADs to a printer.
Thanks
Fritz