Hardest broadhead to tame?

[moleman]

Ive shot a lot of broadheads ( all of which were great heads) but the one that gives me the biggest problems is a Zwickey Delta. Ive shot Eskimos, Black Diamonds, Hills, Ribteks, and never had a problem, but the Delta gives me fits!
Theres no doubt that its user error, but i was curious if any of you folks have run into a head that was hard to tame?  

[Marc B.]

Same here. I can get anything to fly but a Delta.

[Roger Norris]

The Zwickey with the fixed bleeder blade is tough for me. Also the original Wensle Woodsmans.

[The Vanilla Gorilla]

Single bevel 3 blades give me a lot of problems.

[Butternutz]

Simmons intercepters for me. Don