I would go smaller, the 650 is a beter match and I've found Demons are very touchy to being too large. Like was said, pull the bowls, clean out the chips they left in it, visually inspect the metering plates for machining bits hanging in the passsages, and then you can proceed with tuning it. I typically dont buy Demons any more because of the time spent doing basic cleaning/debugging on them even when new.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.