Yep, for your FG, the 5 bar and loom is what you want.
The resolution refers to the number of cells below 0 manifold pressure that are available to input values against everything from fuel trim, ignition timing etc. The 4 bar would hunt around the smaller number of tuning cells, and consequently drove like arse. The Omni 5 bar has changed everything from idle, transient throttle, engine smoothness, ignition timing stability, fuel economy.