So I want to start doing chapter runs but wont be doing them on PC and subsequently won't be able to download chapter saves. So I'll make them manually. What are the setups for chapter saves? (Like when making a chapter three save making sure to do An American Pastarol Scene in chapter two so you won't have to in a chapter three run) Thanks in advance.

Honestly don't worry about stats of Arthur. Just grab the gold bar before the run and put it in the money box ready to buy fast travel. Horse you can get from the random event in Saint Denis which will save you a bit of time during the run

Horse stats little not at all for Chapter 3,4 or 6 as you barely do actual traveling with it so don't stress it. Don't worry about bonding either people over think it so much but the impact is little to none skill is the most important