I used to breed a few corns. When I fed my hatchlings 2 pinkies per feeding, I found they were more likely to upchuck. When I switched over to feeding twice per week of one pinky at each feeding things worked out much better and none of the snakes regurgitated meals because of being overstuffed.
Of course your snakes are not neonates, and therefor they may be able to better hold down a larger meal at each feeding. I do think though that there is less of a chance of regurgitation problems if you feed a smaller meal to them every 3 or 4 days, or even every 5 days.
Best regards,
Glenn B