I had a similar experience with the battery draining on my mostly dormant 2001 3.0i.

Here are my notes on what I did to fix it until the next thing came along:

"HVAC Blower Final Stage Resistor - Twice while the car was in the driveway, the HVAC blower turned itself on with the key out. This is a classic symptom of the common failing FSR problem. Pulled fuse F64 from the glovebox fuse box (right most of the 4 big 50A fuses on the right side), which killed the blower. Bentley says the blower is the only thing on that circuit."

So the clearest mismatch between your situation and mine is that mine was a 50A fuse, not 30A. Maybe you pulled the wrong fuse?

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2001 X5 3.0i, 203k miles, AT, owned since 2014