I see - I join you on a few points; although I'm absolutely not equipped to understand the cosmologic equations and what they imply, I still haven't found a good explanation why redshift isn't a doppler effect but something else.
I think the most widely accepted guesses are that it is a doppler like effect. The idea being that the space between galaxies is expanding like a balloon and this stretches the light waves down towards the red side of the spectrum as they move apart.
There's also tired light which guesses that maybe light loses energy over time or distance. This is possible but there's a few observational knocks against it. Photons should experience a small amount of time as they travel slightly slower than the speed of causality through space's almost-vacuum, but I could be way off.
My guess is that magnetic and gravitational forces can also stretch light waves.
There's alot of hand wavey fudge factors to explain away what they are seeing with the new webb telescope, like "Far away galaxies appear really huge but actually that's an optical illusion!" etc, but even lots of nearby common stuff isn't well explained by any theory right now.
LPP Fusion has some really badly made videos that go into detail about the huge flaws in cosmology, but they are hard to watch. Their own theories are not without holes but at least they are doing real experimental science.
I have a wild guess about galaxy motion but I haven't worked out the math yet. I'm thinking that black holes might stretch space in a linear way far outside the event horizon. Like frame dragging does for rotation. This flattens out the falloff curve for gravity from the square of distance proportional to the mass of the central black hole.
The math involves infinities, and some masses and rotations could even wrap around and push instead of pull for some parts of the curve.