I don't recall hearing anyone ever having to flute a wing rib web for any model of RV; I think it would be a bad idea. The forms for those ribs have been used for countless RVs and if there were a problem we'd have heard of it by now. Without pictures, I can't tell what you're really seeing. I know that when I did the leading edges on my -6A the skins took a lot to get in place. Only the skins were drilled so I had to match drill the ribs. Once that was done, however, it was really difficult to reassemble the ribs to the skin. The skin did not want to wrap around the ribs until all the clecos were in place; then I had to go back and re-insert the ones near the nose to make sure they were centered correctly. Dimpling made it better and worse; worse until the dimples locked together and then better after that. I'm betting that after you get more clecos in (with a bit of swearing and forcing) that it will start to look better.
Another thing to check is that you have the right ribs oriented correctly with the right skin. There is a definite L/R and top/bottom to everything and the ribs will not go upside down.