Too much for what? If you're sending Torrie datalogs with the 80% meth you need to stick with the 80%. If you run less meth you could be at risk. If you run more than what you tune for you're fine.
They say anything 50% or over is flammable. You can buy 49% meth from most of the companies that sell W/M systems. I bought Boost Juice from Snow. Devils Own sells their stuff for a nice price.
