My experience has been that the stock 4 deg is nice. I built one with 2 deg and I needed a 5% mix of rudder with ailerons. When I tried a wing with 0 deg dihedral I saw some more adverse yall. I also agree with Geistware that the reduced dihedral versions just "feels" different. You have to use the rudder alot more to get good turns.

I'm building another 4*60 right now and will keep the 4 deg dihedral but the 2 deg is not too bad, every design change has pros and cons. I would suggest making the rudder 1.5 to 2 times larger and increase the elevators by 1.25 as well. Pull-pull works nicely with the larger rudder. Also the Sig Smith Mini Plane cowl fits with a little sheet balsa added to the sides. There are so many things you can do this design, I love them!

Marcus