Corn Snake size and feeding help

[Outfoxed]

Hello (I haven't been on her for a while been busy with College). I have two albion corn snakes both girls (as far as I know) they both are going to be a year soon one in March and the other in April. I had a friend who was helping me with the information but unfortunately had a bad fall out with her and now I'm going on what petsmart has and the internet. But I am kind of concerned she did tell me by the time her snake was a year she was already feeding them fuzzes and she was a lot bigger then mine are now. I'm just wondering just how big should they get around a year old and when they should be moving off pinkies right now I am feeding them weekly on Sunday nights one pinky each. Is that the right amount? Should be concerned that they haven't grown in widthwise as much as the have length wise? I don't want to be underfeeding them at all...every time i ask them at petsmart (i think they are sick of me asking the same question every five weeks) If I am feeding the right amount they tell me one pinky weekly and move on to a fuzzy when the pinky is no longer bigger then its head. is that right or am I starving my snakes? Pleas anyone with answer would be great help.