I shoot a 32" gun for skeet from the low gun position (issf) and have no issues breaking doubles from any station. In fact I break doubles at station 4 faster than most people that shoot premounted. Low gun allows me to aquire the target quickly and as long as I make a smooth controlled mount I can easily break the first target 3/4 of the way to the stake. I used to shoot a 28" citori and switched to a 32" Beretta 682. Honestly I couldn't tell the difference but my performance did improve, however I believe this to be a function of much better fit due to the adjustable comb. I personally like the 32 inch barrels and would be hard pressed to go back.
I never said impossible
I must admit when I made the post, I had american skeet firmly in mind and sustained lead as well. If you want to win in NSSA events especially the big ones perfection is a prerequisite it would seem.
Though perfect scores are run in ISSF skeet, winning scores are often not perfect.
I shoot low gun now and then purely for fun, and I can break the first target on a double well before the stake, but I wouldn't do it in competition.
American Skeet and ISSF skeet are two very different beasts and employ different methods for breaking targets.