Mq man50........

Think of it this way as well.......the Allegiance is quite a bit faster roughly 10-12 fps right out of the box with the same specs, and that's with a full string load of 2 silencers, brass nock set, and 2 Eliminator style buttons.
Strip that down to the bare string or just a nock set and that bow is now probably over 15fps faster.
Now take that roughly 15fps of extra speed and add an extra 45-50 grs to your arrow weight and what do you have? You have a bow shooting the same speed as the Switchback, hitting with quite a bit more KE and now with the extra arrow weight guess what happens to that TINY little bit of vibration?
Yep you guessed it.

Another way to look at the 2 is this.......you could probably turn the Allegiance DOWN 5 lbs or more in draw weight to equal the performance of the Switchback. Then what do you have? You seeing my point?

That high IBo speed with the hush kit installed and those efficient cams don't mean you have to shoot them that light. That extra performance simply gives you more options.
Lighter draw weight for the same performance and feel at a lesser effort, or heavier arrow weight for more punch for the same effort and smoother shot feel.