I agree with dram, you seem to be just unlucky. It looks like it’s just normal anti-aliasing. At certain angles, it can show up “blurry” though you’ll probably be the only one noticing it. You’d have to pay very close attention to think it’s blurry. What you could do is try to upscale it just a bit, like 1.01 and try to increment by 0.01 until you get the “best” render. Downscaling would also work the same.