Andy,
Your pump is exactly what I need. My pump is very similar to your.
I had see Don Harris pump. It work very good.
But is not enough PSI to spray mist for open engine set up.
Most of the problem with open engine set up is thrust.
The regular pump can put out alot of smoke at lower thrust.
But at full throttle. It just spray smoke fluid away. Not engouh PSI to spray mist for the hot thrust heat up the smoke fluid.
In the pipe set up if different. The smoke fluid had enough time to heat up to make smoke.

I want my smoke system to work at lower thrust and at full power.
Most the smoke system I had buy just work in the lower thrust range. It get less smoke at full throttle.

Tam