I think my problem is. I'm frequently hitting between two keys and hitting the trackpad with my thumb instead of the spacebar. On the previous keyboard the keys were high enough where I could instantly feel and correct my position when I was hitting between two keys. Now since the keys are practically flush, I don't get that feedback.  Slowing down my typing definitely helps, but is a pain.

Wow. What you are describing really sounds like the key size / spacing problem. Not the travel problem. Key travel problem is 'usually' strikes not registering, or finger fatigue. Hitting between two keys is because the key locations have been moved  They don't line-up the way the old ones did. On a side note, I type really really well on iPad. (no key travel at all)
As I said though, I don'r own a MacBook, just play with them when at Apple Store. But I sure want one. I just have to get used to the weird key size and spacing (for me)