You will blow through a ton of argon with these but for some things they work pretty good. It's really overkill for stainless and made more for titanium. Rather than a giant cup you might try a follow shield for some of the stuff you have posted before. Also using some foil dams you can trap argon in many tight joints where you need to switch to a smaller cup to gain access. Bigger is not always better.
http://www.tectorch.com/champagne%20nozzle%20II.htm