I'll be adding a SCWD to improve flow in my soft coral tank (still in the planning stages). It'll give you a gradual-switching, alternating flow from two returns. The SCWD works with flows from 50gph to 1200gph so it might help with your tank (relatively cheap too). The current model has 3/4" outputs but I've heard rumours of a 1" output model in the works for larger tanks.
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