I was wondering if u kit veterans out there could help a newb out...

I was using to low of a "grit" and i accidently over sanded the side of the fin on my Daydream glider kit and im not sure how to completely the problem at hand. one side was a "canyon" in the wood with right angles when u look at it from the bottom. I solved this by gluing balsa pieces into the gaps and sanding that side back to the right dimensions.
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However...

the other side has more of a bowl shaped "valley" that would be diffiult to get balsa to mate with due to its shape. So, what should i do with this side?

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should i try to get balsa in to there anyway, or should i just level out the rest of the fin to match the same width? Any help with this dillema would be greatly appriciated.

You see, this is what happens when your not 100% focused on what your sanding balsa...shame on me

thanx in advance