I know this is repetitive, but definitely oversize your hackle on parachutes. The first set of parachute Adams that I ever tied all flipped on their sides because I tied with too small hackle. Also, I would definitely recommend something like turkey T-base feather tips or poly yarn for your wing post. Calf hair seems to be a little heavy and tends to cause the parachute to land upside down (at least for me). This can be very frustrating when you get in the backcountry and realize your fresh set of parachute Adams all ride upside down or roll on their sides.
"I ain't rich, But Lord I'm free" - Amarillo By Morning, George Strait