The brass sounds really mark a change well.
Panning is pretty subjective and, of course, is exaggerated in headphones.
Generally, in guitar rock, hard panning is used for double tracked guitars, (only slight differences in timing/tone/attack etc), to create a BIG sound.
However, it should be used as desired really. Many genres have quite specific rules about placement and level but who wants to be that specific or obstructed?
I though the panning was fine and swapping sides to emphasize the difference between instruments is a tried & proven process. It worked for my ears.
I liked it.

Cheers
rayc
"What's so funny about peace, love & understanding?" - N.Lowe