Well from what I was told by some of the retic guys was they really don't have a set schedule. They just feed them something that leave a huge lump and then let the snake go on that until he/she gets hungry again which one guy told me is about every 2 weeks. You will know when they are hungry and need more food. Or at least that's what I was told. So far it seems pretty accurate as like I said, Caesar is the quietest after I fed him the large rat since when I got him. So I'll probably go off what those guys told me and just feed Caesar a large rat whenever he starts pacing around and looking hungry.
I wouldn't call that powerfeeding. I would call that just normal retic feeding. They digest and have a much faster metabolism than boas which is why those guys told me to throw out the mindset of keeping boas. Retics are a whole different beast. Now if you fed him a large rat every 2-3 days, so he had a lump 24/7 365 days a year, yeah you are powerfeeding but it's perfectly normal for them to eat a big meal and then go lazy until they are hungry again which is when they would go looking.
And like Cloud said, I would do 1 large rat over 2 medium rats. Whenever possible, I prefer to feed 1 appropriate sized item than 2 smaller items. At 5', your guy could easily take a large rat. Caesar did it no problem and it was like a 250g rat. The same size rats I feed Rosey who is 7'