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Two things stand out to me. One: IMO, your tank is way too bright. I've never run this much light, to be honest, but it is overkill for most of the animals you are keeping, and more light is not necessarily better. Are the GSPs in a low light place in the tank? Start them in lower light, and then gradually (months) move them.
Two: "lots of ... softies" will cause a good amount of allopathic (that is, chemical) aggression that GSPs, IME, don't tolerate particularly well. You may simply have a species or mix of species that are exuding competitive toxins that the GSPs can't deal with. Do you run carbon or poly-filter and change regularly?
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