Jim Bob,
Yes! Both TPA flavorings are really quite tasty, and playing with the mixes is definitely fun! Good luck in your mad scientist lab, and by all means please share your results with us---good, bad, or weird.
Yes, clear RY4 liquids are unusual. My bottle of Janty Elixir is light-golden (or, as you say, "straw-colored).
"A flavor all its own?" Marketing hype. Tribeca is definitely an RY4.
I'm not sure how much I'm allowed to say, but I want to affirm that Mount Olympus has---like so many vendors---the epitome of great Customer Service, willing to extend themselves very generously and bend over backwards to make sure their customers are well-served.