Another pure 4-flip alg I like: M' U2 M U2 M' U(') M U2 M' U2 M.
I also like F R U R' U' R U R' U' F' R U R' U' M' U R U' r' for Pi twist, but your alg is good too.
Those are 1LLL algs not PLL algs. I think you can find quite a few 1LLL algs in his sig.you will also have to have pll algorithms that don't preserve orientation. can you provide them?
you will also have to have pll algorithms that don't preserve orientation. can you provide them?