The only major effect of dihedral in control line, is to correct for improper vertical CG. Pat Johnston, and myself, ok (Al Rabe, and several others too,not that I put myself in their league) have flown several planes with dihedral. the only one I know of that exhibited any issue with wind was Pats corsair, and it was pretty much only in a gale.
The reason pat and I use it, is because on a semi scale stunter, they just dont look right with the wing in the middle of the fuselage,, so you move the wing down where it belongs, and add dihedral to get the leadouts up where they belong.