I don't have Mr. Malty in front of me, but for a beer that size you probably want a 2 liter starter. If you have a stir plate, 1 liter should be sufficient. I wouldn't throw a vial in with your starter. Isn't worth it to me. Just mash low and long to get your gravity down.
This is an extract recipe. I would throw the extra vial in when I pitch the starter, not into the starter.
Yes, add another vial when you pitch, that starter is not large enough for a 1.075 beer.
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