Yes, that's generally the way to do it if you're solo. You need quite a bit of a PP pool to pull it off, though, since those uncharged casts will chew through your PP fast, and the stacks will wear off if you wait too long without landing another cast.
Note that other players (namely FO/TE and Hero) can also add stacks with their own casts. If you coordinate with other players, you can fire off charged max stack Ilbartas quicker and more efficiently.
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