Starting on floor leveling

Dealing with the ceiling ended up being a pain on such an uneaven floor, and I need to add a load bearing wall because of that old addition on the house, so I decided to do that after the floor.  There are a few ways I found that you can level a floor.  The only one I really saw online was using self leveling cement, but there were a bunch of reasons I didn't want to use it here:

• It would add a lot of new load to the house that it wasn't designed for, and in the spots where it's the heaviest, it's probably where the least amount of weight should be
• It would be very expensive, from what I quickly calculated, at least 6x what redoing the subfloor would cost
• The cement would crack over time, and the problem would come back, but I assume more noticeable
• The floor squeaks a lot, everywhere, and it wouldn't fix that

So I'm going to be using two different methods.  Here's the joists in the front room after ripping the floor up

This is one of the two methods I'm using.  This is more time consuming, but also doesn't require any extra material (excluding the OSB for the actual subfloor).  It's essentially just cutting a large shim to go between the joist and OSB.

This was my process for it:

1. Pick a height that is high enough above the highest spot on the whole floor where it will still be thick enough to have structural integrity
2. Get an old 2x4 that I had from tearing the walls out
3. Clamp it to the side of the joist, put one end to the right height then level it
4. Mark it (very darkly, since the wood itself is dark)
5. Un-clamp it and cut along the line on a table saw
6. Dry fit the new shim to make sure it's right
7. Dust off and put a good amount of liquid nails/construction adhesive down on the joist
8. Put the shim back on
9. Drill a pilot hole, and screw it in every few feet
10. Repeat 2-9

I'm using 22/32 tongue and groove OSB for the subfloor surface material, so then its just cutting, gluing, and screwing that into place

I also decided to put my ~25 bags of waste insulation out for the city to pickup on my bi-weekly extra trash day.