I solve 4x4 blind using simple commutators for both edges and centers. A buffer/helper method I learned from the "How-to" section.
When I encounter parity with edges using this method, I.e the buffer and helper needs switching, I use this alg:
r2 B2 U2 l U2 r' U2 r U2 F2 r F2 l' B2 r2...