ct, as you don`t provide further details,is this a new type of aircraft,or something that has been modified...?
In any case ,the aircraft /company/design staff should have all relevant details about A/B ratios, vertical wind-tunnel model tests,stalling test data, stressing ,pilot escape options.,requirement for anti-spin `chute,telemetry. The list is long,and especially so if you are doing this first time.Are you a certified Test Pilot...? Is the aircraft piston,t/prop or jet...?
When I taught student test pilots/engineers in a piston engine aircraft,I would stall the aircraft,then pull the nose up and stop the prop,then stall and spin.This way there were no prop induced effects,and spinning in either direction was generally the same.
Whilst the tests might require the `maximum` imbalance,it should be very cautiously approached,probably 5% increments,and the aircraft inspected each flight for signs of possible distress...Go very carefully.......