Rat Babys/Fuzzies Under Weight!?

Ok, some idiot had me start the little ones on Kitten Formula , which turned out bad because it made them emaciated. Its too low in fat, nutrition, etc. I switched the little ones to Puppy Formula, because its alot better than Human Infant Formula. (Yes its is, the average protein and fat ratio is way- way too low, rats require 12.4% fat while human formula only has 4.5%-5.0%. Yeah, trust me. I wish they have a specific formula made for rodents. These little ones seem more active but i cant tell with the weight, i also dont have a scale. I also have them on the generic brand of Pedilyte, since they got dehydrated and it took me several feedings to get them back hydrated. The Puppy Formula has 9.5% Fat and 7.2% Protein. and its lactose free, anybody who says to differ , your so wrong. My babies need expert advice, i am a rat breeder but never had a orphaned rat ever. I have been waking up at 5am everyday to feed them, and every 4 hours after that until 8 or 8:30pm. I researched online that at 2 weeks they don't need a night feeding. they have been kept warm , they are with a Nanny 'aunt' rat that's pregnant but not expected until another 2 weeks. please , i need to know how to increase the formula fat ratio to help them back on their feet. They are walking/crawling and squeak. both of them also urinate and defecate regularly. Help....