Practice it with a metronome. If your rhythm messes up in faster tempi it usually means that you're messing it up in slower tempi as well, it's just that it's harder to notice when you're practicing it slowly.
Yes. But this also points out an inherent danger.What you're doing at slow tempo doesn't work at fast. Therefore, you're doing it wrong.So if you continue to practice at slow tempo without figuring out WHAT you're doing wrong, you will make it permanent. Practice makes permanent, not perfect. This is how speed walls are built.You will have to do some experimentation at fast tempos but in smaller sections to fix this.
I thought about this. I can play them fine slow, but once I speed it up, I can't get my fingers to cooperate evenly like I want them too. And the left hand seems to have more problems with this than the right. Maybe it's a dexterity problem?