Some that I've heard, believe it or not, is Tremec was being pounded of not having a tranny that would hold the torque that people wanted. So, they kind of rushed the 600 to production, but doing so, created a mess with the shifting. There has to be a lot of people that just don't know how to shift. Like you said, using you open palm and going straight up will go right into 3rd.
I love the Cuda's and other MOPARS , but their "Pistol Grip" handle is a cool design, but aids in miss shifting. A simple round knob works the best.
That being said, I hope it's not the design of the trans, just a bad rumor....
Does the Tremec have the same 2nd to 3rd mechanism, as with the Pro 5 to aid in miss shifts ?
If so, what makes the Pro5, Steeda, MGW and Hurst any better ?