Are you using that mouthpiece and cart to screw the 901 into the adapter?
I'm thinking the mouthpiece is turning allowing the filler to get tangled in the atty wick.
If it turns, twisting the filler, it would be like wringing out a dishrag which would cause the flooding.
Use a mouthpiece with no cart to screw the 901 in the adapter, then slide the regular cart straight on without twisting it.
That's the only explanation I can see if it works well with another device.
You are a friggin genius! Worked like a charm! Thanks never.