Yep, like many have already stated, if you're going to keep those serrations in the crank, you're better off with that rope seal. Those serrations are there to trap oil and keep that rope lubricated. If the rope were to go dry, it'll burn up and leak.
The BOP was never going to work properly with those serrations. They will seep oil past the serrations as the rubber will not fill those voids like a rope does, hence the leaking while sitting there. In severe cases those serrations can actually eat away at the rubber seals.
The rubber seals are designed for a nice smooth surface. Some aftermarket cranks apparently come either way. If you have serrations you either have to make the decision to polish those serrations down so they aren't so severe if you want a BOP seal, or just put a rope seal in it.
It's really a pretty simple deal really.
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