(1) I think in general, GIB should prioritize bidding NT when reasonable in preference to 4 cd & 5 cd minors when partner makes takeout doubles. Partner may be distorting with 4-4 in the majors, NT often scores better, 3nt is a more frequent target than 5m, 1nt shows a decent amount of values but still keeps the bidding low.
(2) If partner is either passed hand or balancing seat, it should underbid by a K or so relative to direct seat doubles.

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