5.9 Magnum flywheel - DIY with bolt-on weight??

Its a flywheel off my 318 magnum "internally balanced" ran it for 2 years on the 318 with no balance issues.
so now i put a 360 magnum in its place I drilled the holes and threaded them 4.9 inches from center on the flywheel so i could bolt the wieght that was on the flex plate to it.

I have the 3.5oz wieght that came off the flex plate bolted the exact same radius away from center and exact same degrees on the flywheel. Im playing around with diffrent wieghts trying to find a sweet spot but im having very little headway lol.

what im really getting at is if you were to add wieght on an internally balanced flywheel for a 360 mag where would you exactly need to place the wieght, TDC? 10 degrees before? this will help me out alot! Thanks!