I agree with the lope, lope, lope some more line. One thing though, make sure you are collected. If you are loping on the forehand for a long amount of time, that's not helping you. When you do the downward transitions, back up until you feel his rear end engage and then ask to lope straight out of the back. If you lose the forward motion and become strung out, don't keep going. Transition down and get him collected before loping off again.
Don't worry as much about SLOW as proper movement and consistency. You'll do fine. Good luck!
"Be a best friend, tell the truth, and overuse I love you
Go to work, do your best, don't outsmart your common sense
Never let your prayin knees get lazy
And love like crazy"