Pyramid Performance Pure Nickel D502

I love the sound of these strings. I like them better than the other hex core, pure nickel Pyramid strings (in the blue packaging). These green ones are more expensive though and I have no idea WHY I like them better. They just feel nicer under the fingers (a tiny bit more flexible?) and seem to have a SLIGHTLY smoother tone. Maybe these have a thinner core or something? In all other respects they seem very similar to the blue ones (apart from the silked ends that I frankly don't care about).

My only complaint is that compared to similar strings from other manufacturers I find that I have to raise the action slightly to avoid severe fret buzz. This unfortunately seems to be the case for most Pyramid roundwound strings. At least when I play them... But I love the sound and feel of these strings so much that I'm willing to make this compromise.