I have a question regarding rollers. I have had my rollers for two weeks and can ride/balance pretty good. However, when i go to do one legged pedaling drills on the
rollers the bike tends to surge back and forth. What part of my pedal stroke is messed up? And what kind of drills can i do to improve the stroke?

When i do spin ups on the rollers i get up to 110 and i start to bounce. However, on my
stationary trainer i spin up to 125-130 before i start to bounce. What accounts for the difference? BTW i use a cycleops fluid trainer and cycleops aluminum rollers.
Thanks.