Pretty much, yes.
So long as you are ballpark, and our default tables in the later Elite firmware versions are exactly that for most direct port (spraying onto the valve) injected setups, you would just tune the engine first, then try shifting the timing maybe +/- 30 degrees or so to find the sweet spot.
Generally it wont make power. It might improve economy and emissions, and maybe run a fraction smoother if you get it perfectly optimum. It is kind of like tyre pressures. There is a wide window where it just works, and a narrow point where it is absolutely perfect for that condition and application, but the difference is splitting hairs in the real world.
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