I have trouble with some of mine, but only the ones who are prone to laminitis, as makes their hooves like concrete! If they are out in the field getting their feet damp, it helps make the feet softer. You could also try making them stand with their foot in a bucket of warm water to soften them a bit. Used to do that with my billy as he had such big feet and quite hard hooves (but not laminitic thank god).
Back feet- it's always easier for them to kick! I tie ours up at the head, and have them alongside something, a hurdle, wall etc. then I position myself so they can't swing about, and they do move less. Even so they can still kick. Sorry, that's probably not much help!
Beth