OM603 Front Crankshaft Seal leaking

I replaced the front crankshaft radial seal on the mighty '87 300SDL, and it leaks much worse than when I started.

The car started out with a slight to moderate oil leak coming from the front of the engine. The way the oil got thrown around the various parts behind the serpentine belt, it looked like it was coming from one of the sealing points on the front of the timing chain cover, rather than from the cover itself. A small leak looked like it was coming from the bottom of the Vacuum pump cover, so I replaced the Vacuum pump cover gasket.

I couldn't identify any other leaks, so I replaced the front crank seal. The manual called for a hub puller, but the hub pulled off in my hand with no problem. The mating surfaces of the hub and crankshaft were smooth, with the exception of a slight groove in the inside of hub, towards the front. It looked like it was designed that way, so I didn't think it was damage, so I didn't think of replacing the hub.

I cleaned the timing chain cover where the seal went, and pushed the seal into place, but didn't use any special tool, other than a large socket which I used to gently tap the seal flush with the timing chain cover. Was this a fatal error?

I coated the seal and hub surfaces with a little white moly assembly lube. The hub slipped over the woodruff key and started on the crankshaft. Since the bolt and washers securing the hub seemed to exert an even pressure on the hub, I pressed it in by tightening the bolt until the hub was set. Wrong?

I didn't have a torque wrench, so I applied about as much pressure tightening the Crank end bolt as it took to get it off, which amounted to pulling with most of my body weight on the end of a 4 foot pipe slid over a large 1/2" drive breaker bar with a 27mm socket on the crank end bolt.

Upon reassembly, there was a severe oil leak from the bottom of the front of the engine, that seems it could only come from the seal. It's bad enough to coat the bottom on the oil pan and leave a tablespoon or two on the floor.

Does anyone have experience with this? Could not using the proper hub installer or over-tightening the Crank end bolt cause this?

many thanks
Bruce S