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I've seen a number of pretty good fish come through 8 inch holes. A couple were so big some of the eggs got squeezed out on the way through. Not good. Really difficult to get back down too.10 inch hole look a lot better once you get over 18" or so of ice. Much easier to get 'em in the hole.
This pike barely fit through an 8" hole. Had to squish her back down. Not a record by any means (36"), just full of eggs. That's all it takes.
The amount of debating about hole size when you could all just drill two holes overlapping hahaDouble holes helps get them turned up into the holes and the big ones just fit easier through them.