I was indeed seating too deep, past the crimp groove. Not much but obviously enough past. I set the seating depth by sight and then turnned the seater way back. I then ran the die body in by 1/4 turns untill I had a mild crimp. At this point I just used the seated round to bring in the seater depth as you suggested. The result was a round with a correctly seated and crimped bullet. Later in the afternoon I used the same steps to load my first 38 special rounds. Now the really fun part, I get to test shoot them.
Thanks for the help!