i have to apologize.
First off, I did not notice that one of the replies was from Owain at Malone. Since they are the FlashZilla vendor, his reply should be considered to be straight from the source.
Second, my answers have been merely speculation, I have no direct experience with the product (yet). I was just brainstorming on how the original request might be done, though I personally don’t see much reason why. If I were to go to the trouble and expense of getting an alternate tune, I would opt for the better performance of a stage 1 or stage 2 tune, rather than the almost imperceptible difference between pre-fix and post-fix stock tunes.