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Section 26.6.1.2, ACI 318-14

If the aspect ratio (span/depth) of your coupling beam is greater than 4, then model it as line element in ETABS. If aspect ratio is less than 4, then model it as area element in ETABS. Diagonal shear reinforcement is most effective if the aspect ratio is less than 2. However, code does permit its use for aspect ratios between the 2 and 4, as well. If you do not require special structural wall, you can override shear strength reduction factor: you can change it from 0.6 to 0.75. If the coupling beam still fails, tweak the structural system to lower the demand on that shear wall.