Thanks to all for the feedback... Warhound and Sokol1 really pointed me at the problem. I was setting the throttle to 25% and apparently flooding the engine. I'm getting immediate starts at 10% throttle and no other changes to my start routine... thanks for the help!
Just curiosity Plt_Off_JRB_Meaker... how did you get the YouTube video link embedded with that format (centered, with border and link header)?