Haha, I agree and thought otherwise, I kept reading about one drop per ml, but in the 'simple menthol' thread, someone had it in their wintergreen/spearmint. I will most likely reduce this in the future. I really like a cold snap though and it looks like I will achieve an overwhelming cold snap haha.
You can't really rely on others recipes. Some are quite good and others are quite bad. Thats why it's recommended to experiment with each flavor and additive individually. For instance just mix up some koolata and vape it so you get the idea of it's cooling effect, Then mix a batch of just menthol and vape that, then just mix a batch of cream de minth. After you sample each one individually you will have an idea on what will work for your own taste as well as a better understanding of how much you will need to use.