malcolm
Regular
Something useful I've thought of, would be if you noticed, say four corners of your top colour, but on the left face, you could move the top center to the left face and reduce the CO you had to do. Or, rather than start with a center up and one infront, you could find a particular edge and move the centers to it. I think this would be very useful also in 5x5x5 blind, if one lot of centers has alot of one colour.
I've found these algs for this:
ME2ME2M2
MEM'E'
I've found these algs for this:
ME2ME2M2
MEM'E'