My experience on the smaller junipers is that Fusilade can be pretty harsh on the plant itself. Are you cutting the rate way down when spraying those? I had considered trying a product with clethodim when dealing with junipers, though I know it probably will not work as well.
The bad part about it, most of the junipers that I have weed problems with either have torpedo or bermuda growing through them, or Florida betony. It couldn't be any of the simple weeds.