OP
pepperbelly
Contributor
The metal tube will make no appreciable difference at all. Much too small a surface area for the volume of air that goes by it. You would get better results from an all metal 2nd (old or new), maybe a Sherwood Oasis with condensation vanes specifically for this, or the Apollo aftermarket hydration unit.
Depending on what you get and the condition you may or may not get a performance improvement, but I would not make that part of the decision.
Note, if your LDS is doing an unsatisfactory job with your current reg they would not necessarily do a better job with a different reg.
I now have a new LDS.