Cats are definitely more than just their numbers. We often ask about how they are doing with the 5 P's (play, purr, preening, poo, pee) and generally how they are feeling.
Good luck with the new dose. When you get above 5 units, we usually suggest you can move to 0.5 unit increases, especially if they aren't seeing any green. Think about the increase is terms of a percentage. At 5.5 units, the 0.25 increase is less than 5%. For a kitty on 1 unit, it's a 25% increase. So we like to think about doing increase over 5 units at amounts of at least 10% or 0.5 units.