We maiden my friend's T1 this passed weekend and this what we saw when we were performing the vibration checks, the picture shows the most significant vibration out of all 3 axis, it looks like this is the spot where the receiver picks up the most vibration and at around 90 to 100% throttle.
I haven't seen that much vibration on any of my 3 jets, one reason may be that they are made out if wood and that wood absorbs the vibration better that fiberglass, my wood build jets have many more points where the wood is touching and that also may be helping absorb vibration, the Boomerang is of a composite build and having thicker skin and been bigger may also help absorb vibration better than the smaller jets, all this is speculation based on what I have experience with the jets and Jeti receivers so far.