The key for the carb up is to keep fat low. Its not a huge deal, but for optimal results you are best to go for high carbs and low fat.
Also, it sound slike your carb up is 54 hours - thats quite long. The longest i have seen recommended is 48, and I have seen guys do well, even better, with like a 24-36 hour one.
For the best references on CKDs, the diet board has some very good knowledge. I can't remember the dude's name but one guy over there who posts a LOT if very up on this stuff.
Also, read BodyOpus by Dan Duchaine. Then read "The Ketogenic Diet" by Lyle McDonald.
But in summary:
High carbs, low fat.
And shorten your carb-up phase.