For buffet, that may not be quite enough. Can you serve the first pass and then go self serve? That way everyone gets a shot at both meats ahead of Bubba the human WM truck!
Otherwise, I'd bump it up about 5-8# per meat.
Southern Brethren BBQ Competition Team
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"I love being hated in my hometown!" - David Hair
KingFisher Gator Rotisserie cooker, WSM, Stainless 5 burner with IR gas grill, Turkey Fryer, Weber JD Commemorative grill, slightly used Bandera chamber for future use as a cold smoker, Masterbuilt 40" insulated ELECTRIC smoker