Perhaps your soundpeats are better than the 65T, possible...
Concerning the hiss, I think that yes it's faulty. I had one pair of 65t that I gave to my sister and a pair of 65t active for me now and none of them had hiss issues...
I think there's a bit of QC issue across the board on the TW models. I may buy two pairs of all of them to eliminate it. My E8s, the 65ts, the Anker offerings all have reviews all over the map in terms of both signature and SQ.
My $0.02 on the 65t was that they sound OK. Not great - even for TW. Just OK. But I also reacted pretty negatively to two purely aesthetic things. First, the goofy-looking shape. None of these are "sexy" looking by any means, but the Jabras are extra bulky with that little nub sticking out just like the old "bluetooth douche" earpieces of the mid-2000s. I rarely care what people think about my appearance, but I admit that I felt a little self-conscious with them in, like I needed to tell strangers around me "no, I'm not such a wanna-be that I wear two bluetooth headsets from ten years ago- they're headphones. I promise." Second (and related), they just look cheap somehow - that silver-painted plastic body, the holes, the logo, all of it looks like something you bought at Walmart on the clearance rack. So if Jabra came out with a new model that sounded like Audeze LCD cans but looked exactly the same as the current model, I probably wouldn't be interested.