There's no room to flute the tabs on the F-1011. Since they are tabs with single holes, it should have been fairly easy to adjust the tabs to fit. Fluting does not round the tabs. That's pretty much set by the form for the bulkhead. But because of springback, the tabs and flanges may not be at 90 degrees (or in this case, because of the conical section, a little less) to the bulkhead. Fluting along a flange shrinks the outer edge, pulling it in and making the angle more acute. This is most apparent on a long curved flange such as found on the nose section of the wing ribs.
What you could do for the single hole tabs, to help them conform to a curved skin better, is use seaming pliers lightly at the outer corners to help them match the curve at the base of the tab. However, I had not problem fitting my skins to the bulkheads, and riveting pulled the tabs tightly to the skin.
Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
EAA Technical Counselor #5357