I find the best way to backtrack variables and paths with Mr Bubu walkthrough that have a link in the OP. but I also use URM to check paths and variables. I'm lazy, sometimes I don't want to repeat a lot of the game just to change a variable from True to False or vice versa so I use URM instead, its cheating but if you don't change conflicting variables that may bork the playthrough save there is no issue, I save much more time just changing a variable.
For example my split save was in the end of chapter 4 when the MC either shout out the INK girls or DJ Kink, and later I realized that the correct split save was before by being in Zelda path and another not being in it. So I changed the airport variable later in one of the split saves, didn't want to go back to chapter 3 and play all again with a long freeroam in the middle, the Halloween party.