Did you try your stock
orion cap? That's the first thing I did before I set it up was put m2 nuts on there and took the spring off.
I did play around with the air tube a little bit, it rotates an I used a 1mm bit to bend it slightly to be more centered on the wick.
My biggest issue I'm having is I want to use a large wick, 2.5mm in diameter. But I can't do that because it fills the wick hole and chokes.
However, I've been doing some experimenting with SS cable rope. Which wicks like crazy. It's 7x7. I'll pull one strand off and roll it in the center of my wick, which boosts wicking tremendously. I'm going to pull
three strands off and roll a wick the fits the hole and I'm hoping that will solve the wicking issues will have a large
juice bearing wick for massive hits and vapor.
I will try the tight coil when I do that as well so that the air tube is hitting the majority of the coil.