What is the "porky" taste in certain types of pork?
As I am sure you know, different species have different flavors...beef tastes like beef...chicken tastes like chicken...and, well, pork tastes like pork.  Further, when animals are butchered, we find that different parts of the same animal have different flavors.  Further still, the animals diet before slaughter greatly impacts the flavor we perceive.  Finally, after butchering and during storage and transportation decay begins, and meats can pick up flavors from storage settings.  Then there is cooking, where method and seasoning impact flavor.

All of this is to say, that it would be fairly difficult to pinpoint your particular version of "porky", what that means, and what to do about it.  I think the best advice I might come up with is to try a different producer of pork mince...or purchase a larger cut and mince your own.  Maybe, it will turn out, that you just don't like pork...so move on and use something else.