Finally solved this one too. Previously got it down to 2off. Today's first attempt 4off, then I solved it, but to me it seems like I just repeated the same moves, bizarre. I think the crucial element is placing the middle section.
I was rapidly 2 off, and since there was no free room for alternative routes, it was clear to me that the 2 off can only be a matter of ordering. Got it straight after that. Fun all along.