Simple question.
If I make a 5 gallon 1.060 batch, split to 2.5 x2, and money is not an concern, would using a full “smack pack” be too much yeast in each?
short answer, no.
check out mrmalty.com or yeastcalc.com
in fact you are almost exacly right with 1 smack pack per batch if the yeast is fresh
+1…should be almost perfect…I pitch 3-4 for a 5.5 gal batch with no starter