Because the first half of the pen "worked" and the second half didn't and the only thing changed was the accelerant, I certainly see the logic of Tim's surmise that it is the accelerant.
So, my focus would be on the difference between an aerosol container and the "spritzer". An aerosol can be used about 6" from the blank to 18" or so, all successfully. A spritzer, if used too close to the blank, will spew "droplets". So, my best guess is the distance from the blank should be increased.
Take this for what it is worth, as a "hypothesis". It will not be a "solution" unless confirmed by experimentation.
IF you just want to return the products and go back to the way that has worked for you---that is fine, too.
We aim to please!!!