This is a question that I've just recently had about how your piloting skills affect the hyper-speed of a ship. I have been stuck in a bulk for most of my existence in the SWC, so it really hasn't been that much of an issue. However, I am in my YT now and I was wondering if the '.1, .2, .3, etc.' is the number of your piloting skill level. This may be a dumb question, but none the less, I'd like to know.
The decimal places on the hyperspeed are simply more ways for you to break the speed down to arrive somewhere at a tactically advantageous time to yourself. Your piloting skill is always taken into account separate from the hyperspeed you choose.