I have a question about edge orienting using Petrus method. Would it be faster/slower to orient the edges when 3 f2l slots are solved rather then fixing edges when 2 f2l slots are solved.
Orienting edges with 3 slots done would be as much as three times longer by my guess. Actually, what your thinking of is called VH. In VH you put in the last F2L pair in a manner that orients all last layer edges. It requires...hmmm....32 algs I believe. It's also pointless. Pretty much it just transfers some of your last layer work to your f2l, without speeding up your f2l like bad edges.(step 4)