That really sounds like either your throw or something with how you have your yoyo set up.
I would adjust various settings like gap width (too tight, too wide), string condition, bearing condition (string fibers/dirt in it). Maybe you hit the floor/wall and didn’t think it caused any damage?
Can you in no way, shape, or form throw a smooth sleeper with it? That’s the only way I would consider that somehow you got a “bum” yoyo.
I really think this whole “Yoyojam vibe” thing is blown waaayyy out of proportion. I’ve been buying Yoyojams for like 10 years now, they’re probably half my yoyo collection. I’ve never had one, even their cheaper ones, that vibe the way the original poster is describing.
“Yoyojam vibe” is a very, very slight and not very noticeable thing in my opinion. We’re talking about the fact that a plastic/metal hybrid isn’t as 100% balanced as a well made metal. Say for instance a plastic/metal hybrid and a well made metal yoyo are thrown simultaneously into hard, fast, perfect sleepers. The metal yoyo up close will look like a spinning gyroscope, like you almost can’t tell it’s spinning. The plastic/metal hybrid will have a very slight vibration to it so that you can tell its spinning as opposed to that perfect gyroscope look the metal has. This isn’t even something you could feel through the string, only see when you hold the yoyo up to your eyes.