Your numbers would be in a range where that was feasible, but think about how fast you're going to drink it. If it's something you're going to serve for a festival or event where it will be gone in a few hours, it may not be a big deal and no one may notice anything off about it. If it's something you're going to drink at your house over a few weeks, you may start to notice things at serving temp and carbonation levels which aren't evident in a hydrometer sample.