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The lower ratio leads to stable structure, but it does not mean that one cannot ensure stability with larger ratios. For larger ratios, you will need nonlinear analysis to ensure that. The ratio of 6 is too much, check if the ratios are correctly calculated by ETABS; it is possible that one of the displacement may correspond to horizontal members. Cantilever horizontal members will have more displacements in horizontal plane than VLLR (vertical lateral load resisting) elements and ETABS can include those values in calculation of drift which is misleading.