A 1% difference is negligible, I donât think Iâd even notice. It doesnât matter if itâs exactly that precise, as long as it doesnât leak from the RTA. 
But I donât know if I should stick to 30%. The bottle and the manufacturerâs website say this much. Other sites say 20-25%. So far, itâs only leaked once. I hope it doesnât happen now I need to save because I only have 4 dl of VG left