How far down the tube is the hitch hole made (1/3rd), and does it matter if its in the left or right side?
Left, or right is dictated by which side of the flow you are, putting two holes makes the fly ...ambidextrous, so you can change which way it runs across the flow.
Keeping the side hole in the 1st third keeps the directional balance / stability of the fly as it runs across the flow. I find the closer I go to the mid point the more tangles it generates, so I tend to keep it as close to the head / wing as possible., and adjust the angle to the flow by repositioning the rod / tip position. With a bit of practise you can steer the fly quite accurately, and skate any pocket water around rocks, flow lines, etc.
I do hitch tubes with one, or two holes, this is dictated by the size of the tube, as I find the micro is weakened too much with two holes....
I prefer FITS tube, as I find it softer, and more flexible than some other tubing.
Pierce the holes at 45 deg to the tube from the head towards the tail, it helps with the threading, and I have had a kink generated in the line, when pulling out of a snag, with the hole at 90 deg, especially with hard tubing.
If I need to create a bigger wake I tend to just go to a bigger winged fly, and not reposition the side hole, as it is more stable, and tangles less....they can skip over themselves in broken water.
Mel....