Jo_Vision, the "Erdnase Shift, Two Hands" is not the classic pass. In Expert at the Card Table, he describes several shifts, the classic pass being the first, under the title "Two-Handed Shift". Just thought I'd clarify that for you.
As regards practice, there is a massive amount of confusion and misinformation among even highly-respected magicians on this subject. I've seen a Eugene Burger video where he extensively extols the virtues of "conscious practice", saying that you need to set aside time for practice, and make sure that you're focussed and you know exactly what you want to achieve in that time. I interviewed him at Blackpool this year and asked him about this, querying whether that implied that having a deck of cards in your hand twenty hours a day and just playing with moves was not a worthwhile way to practice. His response was that whatever works for you is fine, it's all down to the individual. A response which, to my mind, made all his teaching on effective conscious practice redundant.
However, I have done some research on this, speaking to teachers in various fields and my findings are as follows:
1. You can't expect to concentrate fully on one thing for more than about 20 minutes at a time, so, if you're learning new techniques, work on one thing for 20 minutes then switch to something else, then you can switch back again.
2. Develop "katas", or routines that incorporate as many moves as possible and then run through them over and over again while your main focus is elsewhere, watching TV for example. Essentially, make them into a habit.
3. Become part of a group. When you regularly meet with other magicians to show them your stuff, it inevitably creates an element of healthy competition which means that you will have increased motivation to improve faster. Plus, feedback and criticism are essential.
4. Set yourself targets, and write them down in a prominent place in your practice area. These need to be realistic, and very specific so you can be absolutely sure when you've hit them. Rather than "By the end of this week, I want to be better at the strike second deal", make your goal more detailed "By the end of this week I want to be able to deal continuous strike seconds to any number of players called for, while keeping a steady rhythm and without looking at my hands."
I've got a whole load of material on this on my old computer so I'll see if I can resurrect it. Anyway, hope some of this is helpful.