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Yep, level 3 is enough in most cases. That's where I have it now. Level 4 is more for an edge advantage, but it may not be justifiable economically to buy 5 more Grums. I just want those edge advantages. :)

No problem to max out to the fullest if there is an extra fund. 😆

Even with leveling up, I only do it if it is really necessary.