You mention your pearl looking flat........ like a matte finish compared to a gloss?
The ProTech is pretty good, but it comes out somewhat matte also. I believe it is the mica stuff that is added that causes this. My straight mica/clear has almost a completely matte or dull finish when i just dip it. Maybe you could add clear to the ProTech (or other brand) pearl, but i would be afraid it would take away from how vibrant the pearl looks, letting the lead head color 'bleed' through. That might be OK if you are using a bright finish alloy like tin, but most of my lead is pretty dull and dark gray after sitting around.
If you just want the gloss/wet look over top another color, here is my trick to keep from getting too thick a coat of clear that might crackle on you................. dip your pearl and then back over the heat to make sure it is all stuck so it does not come off and contaminate your clear. Let it cool almost completely, maybe 5-10 secs depending on the size. While it is still just barely warm, dip it into some well fluffed clear powder. The clear powder will not gloss, but it will stick almost like static cling and look like it is just a dusty nick-knack that has been sitting on a shelf for years. Put it back over the heat and the clear [should cover it and create the gloss look.