Hey back
I have always been told that triggers can not activate off of triggered actions (ie. "Onslaught" can not trigger off of an attack that was triggered by "Onslaught")
However, when I decided to help answer your question I looked through the rule book to give you a page reference so you could look in the rule book for clarification, but nowhere in the rulebook am I able to find where it isn't possible to continuously trigger actions. If someone knows where it says this in the book it would be great if you could post it up here, otherwise it looks to me like you can, in fact, do what you did with the Vics.