If figured I would quote just that part so you don't get responses that don't do you any good.
Of course it can leak from around balancer if it isn't on all the way, AND since it isn't seated against the shoulder on the crank AND you don't have the washer on it AND don't currently have any PCV AND the fact that the factory uses sealer or a seal washer between the balancer and bolt, AND there is no slinger I'm not the least bit surprised it blows oil especially when you get on it.
You need to get that thing on there all the way.
Betcha oil is coming right out between the balancer and crankshaft, and on top of that the balancer is what holds the bottom timing chain sprocket solid to the crank, and could very well shear the key off and trash that valve train.