Looks like Dan is back after some soul-searching. He was definitely shaken by the Royal Oaks tourney, because he was actually striking the ball decent but the putting and chipping let him down (he ends with an anecdote about hole #17 on Saturday that he said typified his tournament rounds).
To save some of you the full read, his analysis has led to two things:
1. Better mental game: he's attending a two-day seminar in Denver (Lynn Marriott and Pia Nilsson)
2. Better stat tracking to focus on the right weaknesses:
a. Score within 100yd
b. Approach result from 120-200
c. Quality tee shot tracking (including par 3's, and more than just FIR)
d. Feet of putts made
e. Chipping proximity
There's no mention of changing his learning/practice routine, but I'd think he needs to reevaluate all of that. Going to a seminar and tracking new stats will help, but the key for him will be improving how he practices and making sure he is learning from a source that will point him in the right direction (and be available often enough to keep him from going down the wrong path by himself).