Nate:
The name Lisa also rings a bell 
-get yourself across the dam and discover your roots sometime, but be prepared for a 2000 mile car-ride to see all of it.
I think my tweak is a simple and efficient one,-I must have had one of those bright moments
Great whistles. I’ve had and traded off/sold some brass ones and always went around spreading the"gospel" about how they’re warmer or something than the nickel ones. Well I got a circa 1992 nickel one in a trade with a trusted Board amigo maybe two years ago, and it’s not only warm, it’s hot. Great whistle; like it better than any of the several brass ones I’ve had and very balanced between the octaves - surprisingly smooth and sweet in the upper end. Point is I guess don’t knock yourself silly trying to distinguish between the brass and nickel based on what others say - if you get a hold of one and really like it, doesn’t matter if it’s brass or nickel (unless you have some sort of allergy). Hey, go crazy; I hear the sterling silver ones are velvety sounding…
Philo
Assuming you play it in tune, or want to for that matter.
The intonation has extraordinary flexibility, good for expression. You’ll get similar flexibility from other fine whistles like Overton especially, and Reyburn.
But backpressure is practically nonexistent in a Copeland, feel it in your diaphragm palpable in an Overton, and about in the middle with the Reyburn.