All 168ish so the shape does the work and my arm can range it at less than full crush.
The ESP, both 1st Run and others, are slightly flatter and higher plh than the 2 pre circle stamp Zs. ESP grips fine for cold weather; no need for FLX. I enjoy a pair of teal blues that are totally un-natural colors and very easy to find even in fall.
I actually throw mine more for shaping lines than high winds, and it flies nicely as a mid when spun harder/less air speed. Either huked flat or force started with some anny, it's darned handy for going out past 'x' and then flexing back. You can get more stability from a FBird or even more from a XXX, but they only seem to want to go left soon unless lots of air is going over them.
Between my Wasp and PD, it gets used as an Eagle-X + +
The dx Viper makes a nice starter Pred for those with less oomph.