At this point, I'm just interested in seeing where the contact was, what hit what, and why the trigger didn't work. I'd much rather see a pic of the problem, than try to envision it through written words.
I'd also much rather use a trigger that didn't decrease a capability that is built into the base rifle. So, in short, I'd run a compatible trigger, something like a Geissele, rather than an incompatible trigger, such as the HF.
Maybe one of the Geissele triggers wouldn't work either - I just have a hard time understanding where this interference was, and how a standard trigger worked if something else won't.