As someone who has just started going w2w, and still have some issues, I sympathize. It drove me crazy for quite some time.
My friends kept telling me to stand tall at the wake, along with holding your edge, proper handle position, etc...
For me it was to much to think about all at once. I started just making sure I had one step down before I moved on to the next step. I made sure my cut out was nice and smooth, then made sure to get in the ready position, then concentrate on edging all the way into the wake.
Once I had this down, I could concentrate on the pop. Don't worry so much about standing tall at the wake, as opposed to keeping the same stance all the way in. You will find that, even without standing tall you will still go w2w, albeit low and fast.
Once you are at this point, then working on the stand up becomes less of an issue. You will have all the components of the w2w that you know, and can concentrate on standing tall at the wake.
It can be frustrating, but the reward is well worth it.