Why don't you switch to natural organic fertilizers. See if that gets rid of the problem for you. You're plants will take it a lot better and will end up tasting better in the end. I'm not the best at identifying plants, but I'll tell you that 99% of strains now are hybrids. You can best tell the dominate caracteristics by smoking the finished product. A plant that looks Sativa dominant may smoke like a indica and vice versa. It is sometimes hard to tell.