The thing with me is that I don't have the discipline or dedication to make sure I gradually develop the technique everyday. Sometimes I go a week without playing, and any progress I've made will be lost when I pick it up again. I'm getting there though, and I've found that the best thing to do is play at my clean threshold as perfectly as possbile. Eventually, I become more comfortable and I begin to notice that going a little faster while still playing clean becomes a little easier. Before I would try to go as fast as I can, but I would just end up practicing all the mistakes I was making.
I've been there, and probably still am, so I can't say that I'm a beacon of light when it comes to good practice routines. The main mistake I always make is that I don't finish what I've started. I may start working on a particular solo with great enthusiasm, but then the next day I figure I wanna try something else. This string-skipping thingie is something I attempt every now and then, but I never sit and work on something for a certain period of time each day.
If I did, I'd be a monstrous shredder.
What I would recommend is to set aside one hour each day to work on a specific solo, exercise, song, whatever. The important thing is that you figure out what you need to learn, then work on it until you feel comfortable with it. Be completely honest with yourself, never taking short cuts. So many young guitarists make the mistake of rushing with an exciting new lick, blazing through it with the distortion cranked, and then thinking to themselves that they now know how to play it.
Fuck that. It doesn't work that way, and it never will. What happens is that those exciting new licks that sound so impressive played by a Gilbert or a Petrucci, will usually sound like moist ass once you try and do the same thing outside the confines of your bedroom. I've learned this the hard way, working on fancy sweep licks for hours and hours, only to discover that they just sound like exercises, and not a natural extension of your regular musical vocabulary. They sound forced, and that's the one thing that separates the amateurs from the pros. My solution was to stay away from those big, impressive licks when I record solos, and instead try to rely more on what feels natural. Usually, what feels natural to you will also sound natural to the listener, and it's better to sound comfortable and not overly flashy than it is to sound like you're trying hard to impress the listener.