Same problem here (with a 2520). Not to be a smart guy, but the way I solved it was to switch back to my rear mower (not the only reason, of course). I do have a mulch kit for the 62D, so maybe I'll try that and see if it helps.
I was also thinking of making some kind of a screen on a wire frame that would sit a couple of inches ahead of the grille. It could be attached to and supported by the grille guard. Maybe a three-sided affair, like a fireplace screen. Not sure if that would actually help or not, but might be worth a try.
Then again, I really like my rear mower....
