Do yourself a big favor and always remember this: First Time warbird flyers and Clipped Wings is never ever a good idea.

While its true vortice generators if done just right (good luck on figuring just right) may marginally improve roll response However that is not your problem with your RC model in first place. What is a very common and serious problem with many RC warbirds is high wingloading, especially as the fellows keep slapping on scale stuff and details. Well turns out that clipping wings only make that wing loading even worse never the other way around.

Now another effect of that heavy wing loading is it will demand greater piloting skills! That does not bode well for the first time warbird pilot.

John