On my new (to me) Yamaha BB734A I can wiggle the pickups. They seem slightly loose.
The reason I’m asking is that I also have a Yamaha TRBX174 and the pickups are firmly mounted and don’t move at all.
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It’s fine, those are just the plastic covers. It just means the springs/foam underneath isn’t super firm, and also maybe the pickups are a bit high.
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I have a Sire P7. It has a J style and P (humbucker) style pick up. The J pick up does not move and as I understand the P style is on a spring and is meant to move a bit.
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I have an LTD B-4, which is a typical modern-style dual humbucker bass, and when I got Thomann’s budget clone of a Sandberg California, I had the same reaction as you. While the humbucker in the bridge position was pretty firm, the split coil at the neck position felt weird and I felt like I was resting my thumb on a marshmallow. This is normal, but did take me a while to get used to. Also congrats on Yamaha BB, it’s a remarkable bass! Are you a fan of Vincen Garcia by chance?
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BlockquoteAre you a fan of Vincen Garcia by chance?
I’ll do a search now - so I guess my answer is no? 
He’s playing with Cory Wong in this video. Amazing player! https://www.youtube.com/watch?v=PdRCT-SWI0s