Ever consider using 30 or 32 gage and building a dual parallel? It's like the Freemax Starre
coils. Take 2 pieces of kanthal, side by side and coil them at the same time. You still get the two coils, but save room... uses only one wick, too and may give you that air flow you're killing with the dual monsters. Hell, you can probably go to a 2.5 mm diameter with no issues if you do that... if needs be to get to your target resistance. Just food for thought.
Something like this, but less beasty:
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