If it is not cut very flat...furling will not work...there will be a large bag/bubble in the mid section that will just flop around in the wind.
What kind of snuffer are you running? I found big differences in making changes to my setup when I had trouble with a Guck snuffer on the tornado. One of the major concerns was where along the pole the snuff is located...too far aft and the sail just sort of bunches up hugely before trying to enter the hoop. After thinking thorough the distances between the sail patches, where the points all come together..I could then make an adjustment on where to place the snuffer along the pole so that sail would start entering before full bunch up.
There are other tricks as well like introducing stopper balls on the retrieval line at the right places between patches to keep the sail more spread out when dousing.

Ultimately, I changed from the Guck snuffer to simple an Alu ring with a Dacron tapered bag...and snuffing has be fantastic ever since.