Switching to toe running is a tricky proposition. I've know people who have dedicated entire seasons to it, later to consider those seasons wasted.
I can say from personal experience that it has been faster for me. I was a toe-runner my entire career. The race distance didn't matter (100 meters to marathon) - I was always on my toes (well, balls of my feet). I had pretty good range on the track (10.9, 22.0, 47.8, 1:48, 2:22-1k, 3:51-1500, 8:33-3k) - primarily, I believe, due to toe running.
However, I ran on my toes, because the muscles in my calves developed in a manner conducive to toe running at a very early age. I have a brother that's 2 years younger than me. He was taller than me by the time I was 5 and he was 3. In my attempt to remain the big brother, I walked on my toes for the next few years. My parents couldn't stand it. Now, I think it's responsible for me taking to toe running naturally, and giving me a speed advantage I otherwise wouldn't have had.
I guess my point in all this is that, toe running, for some reason, leads to faster running. But trying to make the switch to it after many years of established muscle memory can be tricky. In my experience, it depends on your natural propensity to it. How to figure that out? Your guess is as good as mine.