[tknj99]

So I've noticed a vibration between 40 and 60mph which feels like a wheel issue. I've trued both wheels as best as I can and don't see any high spots and pressure at 25psi. It's just an annoyance when I'm on pavement. The vendor claims it's normal and that lowering air pressure will fix but I know it's not. Could the wheels need balancing? Has anyone else noticed the same?
I also ensured that front rebound wasn't soft so it's not pogo effect causing it. Any suggestions are appreciated. Thanks