I don't have experience going from T5 to the Sols, but I started my sols at 65/65/65 and went to 100/100/85 over 7 or 8 days. You could probably do 5% every couple of days.
As for feeding, sure, maybe it helps fine tune corals, I don't think so, but really, until you've got the basic fish food light combo worked out, i wouldn't be adding any extras to the soup.
Simply up the feeding of the fish a bit. So what if you get a bit of algae on your glass every couple days, takes 10 seconds to wipe with a mag float.
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Brad
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