Just my 2 cents- yup- reinforce your fillets fer sure, BUT not knowing the design of your fins, these could shred about .8 mach from flutter. If they survive you'd prolly only be above mach for a bit and then transonic back down into the buffet zone and below very quickly. Sand thru any paint you mite have and I'd use a real epoxy w/filler rather than clay. Make sure you're not screwing up your CG/Cp with the added mass in the back. Tower launch? A lug or rail buttons dirty up your Cd. Try a sim with about .75 to be conservative if you have these. Other than that- hold your breath and don't blink!
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If I had a nickel for every dollar I spent on rockets, I'd have more rockets.
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