Did you use a remote?
No, I didn’t.
I suggest losing the filter only when you are going for max sharpness, i.e. in studio on tripod, remote, macro, etc…
That’s what I think too. It’s better to remove the filter, but at the same time I prefer to lose some sharpness than to have the risk of ruining my lens, just like Nasa said.
BTW, the quality of the filter is very apparent too! My $25 filter can’t compare with a $100 B&H filter, although I think that in my case, I won’t put a $120 filter on my $100 lens. I will be as sad to scratch my filter than to scratch my lens 🙂 !