Congrats on your new, uh, “Fender,” Spino! The “checkered flag” guitar strap goes perfectly with the Mustang.
BTW: The Mustang is the only guitar where i like the neck pickup more than the bridge pickup. It has a special sound, i think because of the position and the short scale. But the bridge pickup on its own sounds too weak in my opinion. With the hot rail pickup i have a good rock sound and the neck & middle position still sounds like a Mustang.
I'm finding similar results on my pickups with my new Jaguar, which is the same scale length, and single coils. Neck sounds really nice and bright, well voiced and clear. And like yours, the bridge PUP is definitely on the thin side, not a hard rock machine. Def does not chug, or even thump, a garage rock snarl is about the meanest it can get. However, I've got a guitar for hard rock stuff, and I think the Jaguar is gonna be more for stuff where I want interesting textures and cleanish tones, so for now I think I'll roll with the kooky stringy sounds I can get out of the stock bridge PUP. But it's good to know that hot rail is giving you nice results if I ever want to take it in a different direction.
After playing the Rail/Mustang pickup combination a while i wasn't satisfied. Then i found some old Duncan Designed SC101 pickups from my old Squier VM 70s Strat. I put them in and they are absolutely stunning with the Mustang. Exactly the sound i was searching for, nice crispy with some more mids and more power. They cut through the mix. I will keep them for shure. Edit: Neck: 6.9 KOhm Bridge:11.3 KOhm