So I tried the salt thing on my glass yesterday with the stout I was speaking of earlier. Although it's no Sierra Nevada Harvest Ale lace, it did improve the lacing a bit.
As for the role of mashing in head retention, I've been told many times to not worry about the protein rest. It use to be necessary 100 years ago since malt was quite under modified. But I've read that with today's heavily modified malts, a protein rest may actually hurt your beer by chopping up proteins in too small a chunks. Anyhow, I'm not equipped to handle multi step infusion mashing at this point. That requires mashing in a kettle with a constant application heat source to maintain the needed temperatures over the course of several hours at the needed stages. It also requires a second burner to start heating up sparge water while the saccharification stage is wrapping up. I just don't have access to that kind of funds at this stage for a second kettle, a second burner a whole bunch of extra gas. So I will tweak the recipes to include some flaked barley, wheat or some crystal malt wherever I can and stick with single step infusion mashing in my water cooler.