Andy,
With reguards to MEKP, if your selective when buying it , you will notice the concentration of MEKP in the solution varies quite a bit, get the higher concentration solution for best results.
I've seen it from 20-50%. also are you adding 2% by volume or are you takeing the actual MEKP content , ie if you add 2% of 50% MEKP your fuel only has 1% and so on.
Stewart
They dont sell 100% MEKP as its too unstable- it is a sensitive HIGH explosive.