The "batch volume" in the profile serves as a default for recipes when you choose the particular profile. If you then change it on the recipe page Beersmith will adjust the numbers on the recipe page (and elsewhere) to adjust to that new volume. So regardless of what you select as the "batch volume" in the equipment profile, if you enter 5.25 as the "Batch Size" on the recipe design page Beersmith will change the recipe numbers to suite that volume. So, yes, if you're collecting 7 gallons of wort and ending up with a batch size of 5.75 gallons but Beersmith has calculated your grain bill expecting a 5.25 batch then your OG will definitely be low.
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