My only warning with this mix, is that HD Clear doesn't have any bleed resistance in it. So, when you add, it actually reduces the bleed resistance of PolyWhite.
If you want a stretchy polyester with a high level of bleed resistance, try Epic Peformance White.
To make PolyWhite a bit easier to print, reduce with Viscosity Buster. Only add 1 to 3% by weight and it will help with it's flow and will de tack the ink.
Erin