Have a mixed berry wine that’s done with fermenting. I racked it to a 6.5 carboy after main fermentation was complete a few weeks ago. I want to rack now to a 5 gallon to bulk age and clear. I think I’m going to be about a 1/2 gallon short of proper head space. What are the best options? Should I top it off with something? If so what? Should I transfer to a 3 gallon and 1 gallon instead? Thanks!