Hi Dan
I am in no way an expert and will probably get slated by all for even daring to answer such a technical question, but, I was speaking to someone and they have had lines snagging when letting trimmers fully out. Have you checked all the lines when the trimmers are out? He had his speed bar lines snagging on the trimmers because the speed bar lines were all messy...his own fault and I am in know way slating any wings or persons...geez I hate having to cover my arse with all this So no comebacks on me please
One thing I did think of myself, which might be the problem...it doesn't say Ozone on it
Hope you get it sorted so we can see some more of your vids soon.
Simon