Need a Running Whisperer

I thought I figured it out a week or so ago when I was doing speed work. When I ran around 11 minute miles Robbie trotted too far behind me so that I could not even swing my right arm in rhythm to my left: encumbered by the leash and more so by 100 pounds of resistant dog, What happened to my perfect running partner??? How could I get him in shape? Why was it taking him longer than me to get up to speed?? I tried holding the leash in all different ways because I noticed no matter how tight I made it, it still slid down to his ears and then crunched them and that made him go into spastic and resistance head gyrations to get the thing off his ears. So I tried to hold the leash higher. I tried to hold the leash closer to him, closer to me, across my body, behind me, more slack, less slack. Nothing worked!! I wanted my side kick back!! My perfectly in sync w/ me running pal. What happened? I sped up to my 9 to 10 minute pace.
That's when I thought I found a solution.
At that pace, Robbie kept up with me--easily ran next to me--looking exhilarated, mouth open, tale up and wagging, paws in full gallop.

AH!! HA! I thought. When I was under a 10.5 minute pace, he figured it wasn't worth running-- for him that was between a fast walk and a jog and fast walk was just easier.
Too bad that lasted only a few times of me surging forward. The third time I sped up he was even worse, stayed at his slow trot, and I lugged him and even had to yank his leash and call out his name as if I had not seen him in a month and was just so overjoyed that I wanted nothing more than to have him close to me: "Robbie!! Come here good boy! Robbie. That's right!! Good job!" Okay, that brought him up to speed again. But then he slowed down and he was walk/jogging behind me.

So, I realized a new career for some entrepreneurial soul: The Running Whisperer. This canine specialist could train runners and their dogs to run at the same minute per mile pace. I wish I had one right now to analyze why we are no longer the perfect running partners, as we were before.

I would actually love for Robbie to run faster than me, just once. I don't see how he is so out of shape when he is so much more muscular than me and has the herding, hunting instincts, that I was not born with and that do require running.

Those of you that are dog runners, any tips?? Anyone want to be my running whisperer?
My Cesear?
Thanks!