Yes, target about 70% for starters and then log your actuals with every batch so you know what to expect.
I'd just nitpick that mash efficiency is how much starch you convert to sugar IN the mash tun, mash/lauter or just "lauter" efficiency is how much of the sugar you converted + how much you got into the boil kettle. Brewhouse is how much got to the fermenter.
Beersmith calls mash/lauter efficiency "efficiency into the boiler".
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