You should use the recommended amount in the instructions. John (Boren), the designer for all of the newer Estes kits, has probably flight tested this numerous times before coming up with that amount. Also look at the fin pods: heavy plastic! This puts the CG way back without the nose weight up front. The three pats should also cover stability when using the heaviest recommended motor (E12-6).
"When all else fails, read the instructions"
Tried to upload video, file might be too big. Anyway, built stock, minimum recommended engine (D-12), flew arrow straight, recovered close to the launch pad. Fun, retro sci-fi rocket.