I've talked about why before, so I don't want to get into it here. Root around in the archives. They are two different things. A softer recoiling gun just means that it will take longer for your face to hurt. If your shoulder hurts, then that's recoil and a soft shooting gas gun will help that.
Face slap is different.
I'd sell the gun for that reason alone. That's one big advantage to the gas gun. In general, I find that most newer shooters have a far easier time learning on a good gas gun like the Beretta 391. The 391 is softer shooting and it is very well balanced. And it's half the price.