<< He then tried raising the rears and quaring off the toes to shorten the
stride on the hinds - >>
Nope. You lower the hind angles, raise the fore angles. Squaring toes can
help, but it's an aggressive (damaging to hocks) way of doing something
rather simple. You're not trying to shorten the stride behind, but delay it
slightly. In front, you're trying to quicken the stride.