For my 9a the weight and balance is easy.
Min pilot weight is 140 lbs. with that or anything heavier, can never exceed forward cg limit regardless of baggage weight (0 to 100# max) or fuel load.
Rear cg needs to be calculated if 100 # baggage, full fuel and pilot and passenger exceeding 450 pounds.
I have cg cards in my plane because it is required, but if pilot and passenger stay between 140 and 450 pounds, there is no need to calculate anything.
The RV9a is a very well designed plane.