If you do not want to monkey around with mixing your own, a good one is T Zone. Labeled for actively growing rye/dormant bermuda. Add the Gallery DF to that.
A softer mix would be just MSM. I would be careful of things likely to cause contact injury to the desirable turf. Violets can take the cold, yes? You could wait until the St Augustine is fully dormant then go nuts.
Do you apply anything this time of year? I know you have lots of St Aug. You're usually just a little warmer than I am. My temps now are low 30's to 60's. The next 3 days will be in the mid 70's.
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