You could but *most* specific gravities are fine. Lemon Lime one seems to be messed up for some reason. TFA Cherry Extract uses some alcohol so that's actually 0.896g per ml. In this specific case I would recommend just clicking on CAP Lemon Lime and changing the gravity to 0.99g (per TFA's sheet). That'll override the manufacturer specific gravity for just that flavor =)
This is pretty spot on. I mixed up one small batch but will definitely be making a lot more. I added in a lil extra Blue Raspberry and Cherry Extract and it's ADV worthy. Cheers!