But since that is a huge PIA, you probably won't want to do all that.There are also products designed to go in between subfloor and hardwood floor, like this:  https://acousticalsolutions.com/product/iso-step-floor-underlayment/And of course if you are considering ripping out the subfloors, you could go with a thick wall-to-wall carpet on top of a thick pad instead of hardwood.

Is the paper thick, or thin and kind of crispy?

The minimum working thickness of those joists is going to be 2x6, which will provide you with 5 1/2 inches, which .

They are great ankle support, strong sole so standing on a latter for hours doesn't hurt, durable leather, comfortable, ok weight, slip resistant tread that is great for walking or roofs, thick sole so you don't get nails piercing, toe protection and under $90.

Also there's no need for underlayment as it has a thick rubber backing on the back.It's 2.15/ft but I have found it's worth it bc of wear level and no underlayment purchase needed. 

I know it might feel miserable being in the thick of is but you are doing a great job pressing ahead and making progress.  

Talking to people is way more effective, but be prepared to have to grow a thick skin. 

Look at the thickness and get a good padding to put underneath if you don't the floors will be very loud when you walk across them.

The houses that had a high quality commercial grade glue have held up great, even though it was a less expensive 2 mm thick / 6 mil wear layer LVT. 

What makes them prefab is that the slab is 2cm thick but has a 3cm quartz edge laminated on the front.