I too like the 10-15% range when feeding but sometime you just can't just ca't hit it perfect and that's nature I guess. I've fed x2 before when all I had available was a smaller feeder and it went without issue. Heck - when I'm done feeding and if someone doesn't want their second, my carpet and BCI are always waiting for more LOL
Glad I'm not the only "crazy OCD" snake owner out there that weighs the feeders to feed in increased increments as the snakes grow LOL It's time consuming but works...just food save them, label, and stack in the chest freezer. Then there isn't any digging around and/or being stuck with small feeders at the bottom.
The 1 order I've placed with Reptilinks I was extremely pleased when I weighed everything (yes - all 300 mice/rats) and had a very slight deviation - 3 total were out of the advertised weight range and on the heavy side.
Very clean - no odor - prey stacked nicely in zip lock bags then vacuum sealed - no frozen blocks of feeders - no parts and pieces either like I've seen with Rodent Pro
Good luck with your ordering and feeding process, it can seem a bit overwhelming but you'll figure it out.
I've also heard, it's better and healthier for the snake to have it slightly hungry rather then to have it be overweight.