Recently bought a custom 6'6" fiberglass 3wt rod. (Lamiglas blank)
Spooled a wf3f line on the reel and the rod seemed really overlined to me.
Picked up a dt2f line today and spooled it on another reel to try this evening.
Took it to the local lake and the rod did much better (actually able to get about a 35' cast out fairly easily), but the more line out the more sluggish the rod began to feel again.
Came home and measured the ERN using the common cents method and got an ERN of 1.
Looks like I'm going to have to buy a 1wt line if I want distance from this rod.
I did manage to catch several 'gills during the casting session, so the trip was fun despite the casting limits.