Rookie - Steve,

My thought on your delema would be to use as suggested a stiffer butt section and then a straight leader section, dont know the quality of the orvis rod your using (havent used one of them before) but the other week my mate and i were fishing for our Australian Bass out of Kayaks with 5wt rods with popper style flies as well as small Deer hair Dahlbergs and cicada style flies with out any problems from the wind.
We used a straight 6ft leader section of 12lb flouro carbon (due to the inherant lilly pads and weed on/in the small lake we were fishing)and had no problems turning the flies over.

The lenght of your leader may have also been a contributing factor in your problem as well. Try a shorter one next time would be altermately my first suggestion as well as using a shorter tighter casting action. If your rod is capable that is. If it is a slow action rod i cant help as all of mine are fast action ones.

I hope my info helps a bit

Cheers

Craig

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"Fishing's an Art form, an Art form worth your learning"
Craig