Sixth walk cycle attempt

Slightly better than previous attempts — at least the arms move properly this time, but they still feel very stiff and very slow. I'm not entirely sure what I'm doing wrong here; I think it may be that, rather than just drawing the inbetweens with the frames pegged as normal, I try to line up the heads so they're at the same height. I thought that lining up the shoulders that way meant it would be easier to figure out the position of the arms, but it usually ends up comes out looking a bit squiffy. I guess it's because it doesn't take into account the shifting of the body and difference in height in each frame?

I think I'll try a totally different cycle next time as I can only learn so much by constantly tweaking the same one over and over.