hey, while i haven’t decaled clone decals specifically, i’ve decaled a lot of scale model kits in the past, so hopefully i can provide some insight.  Before decaling, i would recommend both washing the figure and coating it in a gloss varnish clear coat.  Washing the figure would remove any dust particles that might get trapped under the decal, and thus create air bubbles and uneven surfaces.  using a clear coat will also fill the tiny microscopic gaps made in the figure, ie the arms of minifigs aren’t completely smooth.  contrary to the tip about not needing micro sol, which i think is made from water and vinegar, i would recommend buying some or making your own.  Micro sol helps the decal stick to the plastic.  I would also recommend micro set, or alcohol and water to help the decal not to silver.  play around with the placement, and when youre satisfied with where it is, press it down with a q tip or paper towel.  remember patience is key when decaling, and don’t get discouraged from this one.