When I use them I do a little surgery first, before they ever leave home.
Cut away all that cushion folderol beneath the cup. You don't need it and it makes it that much harder to seal the bore.
For loading, it's powder, then a "Type A" hard card just below the muzzle, then a well-lubed fiber wad just below the muzzle, then the plastic wad so the petals are just below the muzzle (finger deep), then your measure of shot. Top with your overshot card and push it all down the bore to seat it with one pass of the rod. No multiple rod thrusts for me. Lots easier in the field.
The hard card does a good job of scraping the bore and the lubed fiber wad helps keep fouling soft on your next load.
With the lubed fiber wad in there, I've experienced zero plastic fouling. Just not going to happen with a lubed bore and both the hard card and fiber card between the base and the burning powder.
Also, the spreading petals as the plastic wad exits the muzzle retards the plastic wad along with the others, so there's zero tendency for the wads to blow out through your pattern.
Saying all that, I still prefer to shoot without the plastic wads for simplicity. Only time I use the plastics, it's the WAAR wad, which is a little heavier and tends to improve patterns a bit from a cylinder bore. But mostly I don't need the little extra range I get from a little tighter pattern using the WAARs.