Wait a few days. The glare will be back.
I realize your comment suggests this may all be expectation bias or unfounded perception but I don't think that's the case here. For the past 4 months I had HFTs on only 2 of the windows which I felt were at 1st reflection locations. I never could hear a change and just assumed they were incapable of reducing the glare. On a whim I added two additional HFTs to the remaining 2 windows and bam, a noticeable difference that has endured a couple of days so far. I expected 4 months ago for a positive change and got nothing. I expected nothing this time and got something.