Now the BIG POINT I got form this new OP that Kuro didn't include is to reduce the effect of skills (correct me if I'm wrong I haven't read every post there are too many pages). Which can be done for either idea. The example given in the Title Setup was to restrict Cure (from CON) at 100% as WHM, 75% as PLD, and 50% on any other Title. This fixes my previous problem (I think) of Curing (Lv. 20 restriction would be Cure II) from being used on every single class, or at least not as effectively perhaps even outweighing the use of it at Rank 50. Now what wouldn't change and would even make worse if implemented if DPS skills. Rank 35-50 DPS skills would by far outweigh any 1-20 Rank DPS skills and adding a penalty to this of let's say -50% there wouldn't even be a chance of using this so I think the rank restriction is flawed in this sense. Yet this does make a lot of actions exclusive. The only thing I can propose here is to have two classes to pull any action from in order to fix this and maybe even specializing in 1 advancement class for each class through a talent tree.
Of course I didn't mention that. Thats a given and doesn't need to be pointed out. No way around it.