How are the marbles? I was considering getting some, but I feel like as they will displace some liquid, some will be lost between the marbles at the bottom of the fermenter. Is this the case? Do you feel they do more good vs the loss of must? Do you bury your siphon between the marbles when racking? As far as the "pouring" of CO2 goes, I dunno about you but I have a lot more than CO2 left over in my primary when I transfer to a secondary. I would be pouring chunks of fruit and yeast debris, which is exactly what I am racking the must off of.