Yeah, last time I wore one of my 3" knit ties I asked in MC about knots that might be smaller than a FIH. I didn't get any good suggestions. The photo you quoted above actually shows a FIH knot but it looks like the size of a windsor just because there is no taper to that tie. I may have to just get thinner knit ties but I'll check out the Kent knot you're talking about next time.
On other ties, I've always defaulted to the windsor knot because, having a smaller neck, there is no way to tie a FIH without the tie being way too long. But I also think the windsor is a generally better-looking knot anyway.
I never use the symmetrical half-windsor though.