I owned a 2012 Trigger 7M and found it did as you described in those winds.
High wind kites with three struts are not a great way to go, in my opinion.
I had much better luck with my 2012 10M Trigger and my 2010 9M Trigger, but that was always in lesser winds. The middle sized Triggers are super fun kites, not as big a fan of the big ones and the small ones.
Ultimately, I came to the conclusion that the Trigger would be a better kite if they redesigned it with five struts, like the North Evo adopted after a couple years.
I found the five strut Blade Prime airframe more solid than Trigger.
Recently, I find myself more and more drawn to five strut C kites, just like in the good old days!