Like Hell... LOL
ummm, WATER? You didn't use water did ya? Hope not... If you didn't... you may want to add a bit more Vodka/PGA. Might be right about too much crystal in it.
The Vodka should be fine. If it is still separating, or crystalizing, put the bottle in a bowl of hot water for a while, and shake well every 5 minutes or so... see if that helps.
Normal is 1 drop of menthol drops to 1 ml e-liquid (more or less). Sounds like it should be fine. Sometimes, a bit of tobacco can mellow out the menthol a bit or perhaps a bit of vanilla or ethyl maltol (main ingredient in cotton candy flavored e-liquid, so if you find a bottle, you can use it as a flavoring to add to your menthol to sweeten just a tad so it isn't so Vics Vap-O-Rubbish).
When in doubt... use the spouse as the
LOL