My current favourite WIP is Off the Record, by Hella. It's brilliantly in character, and features my favourite Loki: snarky, dangerous, cunning, and terribly vulnerable.

Summary: It started with a message, a late-night visit, and a God of Mischief in Tony’s bed. A story of trust, trickery, unwilling aid and inevitable attraction.

It is a WIP, but updated reasonably often.

Two other good ones (both complete):

Halo by Paxlux

Summary: The timeline starts in a fall of glass. There’s a staggering loss of gravity as Tony stares up at the suddenly blue sky.

Can't Go Back the Same Way You Came by Pell

Summary: Loki lets go. This is what happens after. (post-film; basically a fixit fic.)

I haven't read any of the three you mentioned. Quite pleased! Please share if you find more, and I will too?