Hi @Night07,
Welcome to FTC! Glad to see you found us from our old Chowhound board. 
(Just so we remember our old friends, were you “Night07” on CH as well?)
Here are some suggestions since you were asking:
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South Bay, Day 1: Since you said you’re going to Kagura in Torrance (delicious!),
besides Mitsuwa Market, you might wanna stop by Patisserie Chantilly for delicious French-Japanese Pastries (especially their Black Sesame Cream Puffs!). -
Sakura-ya (Mochi): Also Sakura-ya is in the area as well, for down-to-earth, delicious Handmade Mochi if you prefer that.
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Dim Sum: Consider Sea Harbour over Lunasia. I don’t think Lunasia is anywhere near as good as Sea Harbour. And J Zhou is not as good as Sea Harbour either, and definitely not worth a drive from L.A. all the way down to Irvine for that.
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Croissants: We’d eat Chaumont’s Croissants over Farmshop, easily. But I adore Farmshop for a relaxing Brunch setting. So sunny, and a nice vibe.
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Day 2, SGV Dinner: Sea Harbour for Dinner. I don’t know any of my friends who’ve been to Grand Harbor who have wanted to go back (we haven’t been yet, because of all the warnings on FTC and with our friends who’ve gone).
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Are there any other cuisines you want to try?
Enjoy your trip to LA!