Hey Heart,
I to have to go slower for some of the different exercises to better tune in and feel the energy. Or perhaps a better way to say it is to allow more time to tune in, something like that. What rings in my mind at the moment is Master Lin saying for example in the breathing in of the universe to feel the expanding and compression between your hands of the energy. Or something along those lines. For me I really have to slow it down to get a good feel of the energy and that means slowing the breath coordinated with the movement. This can vary between steps and movements but sometimes I feel I am only getting couple of those in before it is time to move on.

In that case I feel it is more important to tune into the sense and feel as appose to the quantity of the repetition. I feel more benefit if I take the time to tune in as oppose to just going through the movements. I suspect that Master Lin is so tuned in that he instantly feels the energy therefore his pace is much faster than mine. I hope this helps in someway.