I would keep the SPS up on the rocks and close to the light as possible. Some low light SPS like Montis and Birdsnest should do alright mid way down the tank.
You should be just fine. I use 150's in my tank. I keep most my SPS in the top half of the tank. I keep Pocillipora and orange digi right next to the sand and they do fine. I also have a spongeode frag close to the sand but it doesn't have the color that the mother colony does high up. I have a 90g tank which I believe is the same depth as a 75g.
should be fine....I have green pocillipora growing on my sandbed like crazy....only using t5s on a 90, so would imagine you should be good to go with those corals...
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