Help to ID grass or weed type...

[northeastlawn]

Trying to figure out what kind of grass is in my yard so I can plan for a fall overseed, in the past I think a lot of URI and sun and shade seed was put down. I took these when it was long to help distinguish the different grass types, some areas seem to be very fine short grass that never catches up to the rest...





This is the this fine stuff that always seems to be yellow if never catches up with the rest....


This last patch always seems to be pressed down, it never seems to fluff up, even when taped off and not walked on.

I know this isn't a KBG lawn, and have a feeling some of it might be weeds that look like grass...