Agreed if yours is 15 out of the box that's on the low side, should be 18. I'm guessing your software isn't 105 either. It'll say when you turn your vanquish on at the boot up screen under "empire" or a quick check is if your eyes are blinking.
Update the firmware, fresh battery, since you just relubed you don't have to do it again. And check back in with us
Mine out if the box had the new firmware and I've had zero issues. I will say this. In my experience the vanquish doesn't "like" super thin lube. Stick with stock. I use sleek light coat and your all set