Key Checkpoints and How to Remember ALL of Them

Warning, long rambly post ahead.

As a relative newcomer to this swing style, I've had a lot of changes to make, and although I try hard to remember them all, inevitably I forget some of the key points... and usually at the worst possible time.

For example, if I were to video myself, and stop the video right before I start to take the club back, I would check for: grip(both creases pointing towards right ear/shoulder area) backwards K for proper weight distribution, butt of club shaft pointing towards my belt line, hands forward creating forward shaft lean, feet turned out, and maybe my spine tilt if it's a DTL view, although usually the butt of club shaft pointing at belt line takes care of that.

The problem is, once I get to the course, I seem to revert back to my old swing. For example, the other day I played, and for fun took a quick video of my swing.. grip looked decent, feet were OK, but the butt of my club shaft was nearly pointed at my sternum! WAY off.

So on to my questions:

1: What do you consider critical checkpoints at.. let's say at address, top of back swing, impact and end of swing(not sure what the proper term is for this?)

2: How on earth do you remember them all? It seem like I can never remember all of the things I need to do to hit the ball well. Some days, my weight is forward like it should be, but I forget to keep my elbows together.. then other days my elbows are super glued together, but I forget to keep my hands forward so I have no shaft lean.. etc..

And if it sounds like I'm frustrated, I'm not :) I know golf improvement is a long term journey, and I'm having a great time, just curious what tips and tricks everyone has to help me get good faster..

Thanks!