Car vibration at freeway speeds with minor acceleration

I have a 2013 prius v. For a bit now it's done a thing where it shudders on occasion (almost like a gear switching on a different kind of car) but this week it started shaking, mostly on the passenger side but under me a bit too. It's usually when am barely tapping the gas and for a few seconds after I let off gas, no gas no vibration, more gas no vibration.

There are no sounds on turning either direction. My tire tread has outside wear and alignment could use looking at.

While troubleshooting I came across a video about the coolant hose shaking and sure enough mine was very loose in it's bracket so I zip tied. Since doing so there is no vibration at in town speeds and at freeway speeds the frequency has decreased significantly but it's still there.

Are there any other things I should check to see if they are loose? Is it maybe moving and rubbing just enough that even with zipties it will continue?

 

Engine coolant is at the low mark but that's where it's been since it last got serviced and they did a flush.

Noises are maybe it sounds like it's riding a little harder and than usual and kind of a slight wind noise?

We are going to pop it up and look at it this weekend. If you have any good diagnosis videos I'd love to see them. At least that way if we figure it out we can price shop around BEFORE taking it in someplace and getting raked