Unless your marker is optimised from top to bottom for high flow, low pressure use, running low pressures can actually reduce your efficiency rather than increasing it. Doing so could mean changing a decent percentage of your marker and saet up, so it works out expensive.
A better bet may be to find out the optimum operating pressure of your set up as it is currently, and then tuning it accordingly.
There are a couple of articles in the stuck threads regarding sweet spotting or reg tuning, and these will explain how to tune your current set up for better efficiency.
It's just like a battle zone, you got a bottle and you're on your own.
Gotta be a Scotch or a Kamikaze, none of those other weapons will faze me.
Hundred, hundred, hundred bottles on the wall, you wonder if you can drink them all.
Got to go home by 1am, the bottle wins the battle again.
Husker Du - "First of the last calls"
Back when I was popular
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