I'm throwing 5/6 12'-6" TFO
with a 360 gr. Scandi. Even a 16 inch rainbow puts a good bend in the rod.
Well, that's good to hear, as I've recently acquired the 4/5 in the same model, throwing a 240 gr. Scandi. I think an average bluegill will bend this rod to the cork!!
As to the original post, FK touched on two rods I own as well. The 4 and 5 wt. Dechos.
I've never tried anything but a 300 gr. Scandi on the 4, but it does behave quite nicely with that.
With the 5, I started out with a 360 gr. Scandi on it, and it handled that wonderfully. Tried some heavier Skagit style tapers, and she just didn't like them. Tried the 300 gr. Scandi on her, and she came to life again! Now the 360 is cut back a bit to accommodate turning over some larger flies and heavier sinking poly's. Still dialing it all in, but I think I'm on the right track!
I posted this to somewhat illustrate that unfortunately, rods are all over the place sometimes, as far as what they like to throw, as well as the caster themselves. If you would have asked me a year ago, what's the best Scandi for the 5, I would have said the 360. Today, I would recommend the 300.
Experiment with what you have in the quiver already. You'll probably be pleasantly surprised with the results.
Good luck on the journey- it's a fun ride,