Off the top of my head, on Mr.Ron route - make sure you 'believe' Willy (dwarf friend), if you do not - you are locked out of that route.
When you get to the part when he shows James 'proof', always hit yes - then he'll ask if his dad will let him have the slave the mother, and hit 'yes'.
After that, you're on his route and it's basically just choosing different choices after that point. (if you are on the 'peek' route and don't clean up after watching the mother masturbate, you get a bonus on this route. I believe)