Looks like a good start! And to realize that you have a ways to go, means good attitude!! Let's see what to suggest!!
Have you replaced the top leaders on your handles? Try it with much longer ones than what came stock!! You'll see this topic covered on the Rev forum extensively!! We work to create as "neutral" a setting as possible, keeps the sail from surging off into ??! And adding them should take away a few of your problems with control!!
Under the "sometimes" heading:
Not to sure what you mean by "walking" but doesn't sound important at this point!! I would work to add the inverted hover and slide to that portion! Hard to do good stationary grid turning (clockwork) if you can't control inverted flight!! Also add the stationary bicycle turn to this list! Try really hard to maintain a constant level while doing it! Don't rise or fall, learn to "do it in place"! Another skill that goes here is a simple "tip turn", learning to just turn around a tip, to control height!
Congrats on a good beginning, now keep adding more skills to really see what you and the kite can do!!! Longer leaders are just a start, but it does make it easier!!
In the end there is only one real answer - Time on Lines!!! The more you fly and get familiar with the kite and how it handles, the more you can get out of it!! This is a lifetime journey, ENJOY!!