Okay, yes, the stout run through the sparkler plate at 30psig CO2 alone is the only test I don't have. However, we do have the medium body run through the sparkler plate at 30psig CO2 alone - and it showed no significant difference from the others. In any case, I will re-run the experiment with my RIS in the next week (when the FES kicks, one of the kegs of RIS will go on and I will try it. Don't think I can try it at 1 vol, though, as it's already on CO2 (purge plus a bit of pressure) but will try with what it is sitting at)
BTW - the stout was carb'd at 10psi before I moved it to 30psi Nitro. So it should be 2+ vol CO2 then moved to Nitro and served at 30psig.
Just for clarification, though - why would I want to keep a stout flat (1 vol or 0psig) and then serve? I don't like my stouts flat - I don't think most people like their stouts flat. Is the statement that the sparkler plate integrates the CO2 into the flow - kind of carbonating it right then?
However, I (and I think most homebrewers) are more interested in a more real-world experiment. That is, with equipment that a typical homebrewer will have at home, or that we would purchase from some place like Morebeer or Kegconnection or someone. We aren't trying to match a Guinness "perfect pint" - I know I'm not. That, to me and to my friends, is more of an academic pursuit rather than the consumption of brew. I want to drink my beer - not pour it and then admire it as "perfect" - okay, I might admire it for a second. . . then it goes in my mouth!
I used the same type of pint glass (as opposed to choosing the "correct" class) so that was controlled.
I have a typical stout faucet (no flow control - very similar to the one you can get at morebeer
I have both a good Perlick (630ss) and a low-end chrome faucet (like Morebeer's D1205) as well as good length bev lines (3/16" and about 8' of length)
Basically, my set up is pretty typical and my results should be what a typical homebrewer could expect.
If we have to jump through hoops to get the similar effect to beer mix, then it's likely we won't. Especially when it's really easy to run beer mix.