Baccus is an mbr strain like vp31 and 41
the instructions say to direct innoculate
http://www.lalvinyeast.com/bacteria.asp
But culturing is not a bad idea in difficult musts .
7 days is bit too long , you need to be careful the MLB doesn't run out of fuel and die 3 or 4 days in a warm spot is enough.
Hydrate in 50 ml water (bottled or filtered chlorine free) room temp.
After 20 mins add 100 ml of 50 50 room temp water and preservative free apple juice .
Tightly Cover and put it in a warm spot for 24 hours .
Add 50 50 water and wine 100 ml. Put in a warm spot
Wait 24 hours , add 200 ml wine .
24-48 hours later add to your carboy and add optimalo , stir the fine lees and optimalo in to suspension , then Place in a warm spot under airlock and leave it alone for 6 weeks and then test for mlf completion.
There is no down side to adding more optimalo , you can't od on it , so why not add some?