Smoke oil flow rate should be appx 3X fuel use rate. So, using the needle for control of maximum rate... you should probably start at 3 turns.

Adjust for maximum smoke volume at 1/2 throttle and don't let any more oil flow. (you may need less than that 3 turn setting... it should be close if its a standard .40 to .60 size remote needle valve.) Maximum smoke at full throttle will rob you of too much power. you would be VERY unhappy.

Depending on your muffler setup... you can get better smoke volume by wrapping the headder pipe with a few turns of copper tube as a pre-heater. The pre-heat seems to reduce the backpressure created getting the same amount of smoke when using the stock "can" muffler that came with my O.S. .91 FS.

If you are trying to get smoke with a TUNED pipe... the setup can be simpler than yours. "T" the muffler pressure line to pressurize the smoke tank and tap into the pipe RIGHT by the header pipe for smoke oil injection. The muffler pressure point is the highest pressure place of the tuned pipe. Right at the headder is the lowest pressure point. When the smoke oil expandsion increases backpressure... it will decrease smoke oil flow (sort of a self regulation on how much it can decrease your power).

Caution... the tap-n location to inject oil into the tuned pipe can be at a VACUUM in some pipes! If yours is one of those, the valve used to shut off the oil flow has to be a good one and near the tap-in location to prevent the smoke oil continuing to dribble in.

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oops fixed