Some results from today:
1. Sage SP 4wt. 9' = 24,8m
2. Sexyloops HT 6wt. 9' = 25,5m
3. Sage Z-Axis 8wt. 9' = 25,6m
4. Sage RPLX 10wt. 9' = 25,8m
5. Sage RPLX 11wt. 9' = 26,2m
6. Sage RPLX 13wt. 9' (2p) = 26,4m
7. Sage RPLX 13wt. tip section combined with 11wt. butt section 2,4m in length = 24,6m
Line: MED 5wt.
Carries measured line hand to line end (without leader).
Increasing stiffness offered me an increase in max carry and narrowed my loops (it significally reduced the "bouncing bomb").
Casting the 13wt. rod needs HUGE concentration for me. Smallest mistake and the whole carry is completely gone. Also I can only cast it for a short while and then I need a serious break. It needs huge change in my movements when going from short to max carry.
The more I decrease in stiffness, the better it feels. But loops open up to some degree. Good point for the lower stifness (compared to the 13wt. rod): I need much less adaption of my movements when changing from short to max carry.
It was significant that the 13wt. rod offered me a very good last turn over (windless today). Smaller dangling end.
HT was my favorite for the whole range of casting. The 8wt. Z-Axis was my favorite for distance.
The 13wt. rod simply kills me too fast and needs to much concentration

.
Paul,
I think longest possible carry stands for best mix of max possible line speed and tighest loops with the straighest fly-leg.
I agree that the longest carry is not the point from where I achieve best distance shoots. But still the rod offering the longest carry should mean to have best possibilties?
If you simply use it to aerialize too much of line, the distance shoot easily may start decrease (I agree with that).
I have to repeat the whole test on a really windy day. I think my max carry would decrease significant on the 13wt. because my line speed will go down too much then. But I need further tests here.
Greets
Bernd
p.s.: GT125 is much more fun for me compared to the MED.

It goes 2,5-3m further for me.