Hi, Fred. I might have mentioned this before, but I have been very pleased with the results I get using stock mulching kits on JD decks. I have had mulching kits installed on a 2000 JD 445 w/60, 2003 JD 2210 w/62C, and now on my 4110 w/60. With all mulching kits there is an inherent increased amount of time required to clean the deck and baffles, but the cut is worth it IMHO. Of all three decks I have used/owned, the 62C performed the best with the kit. With all three decks the cut quality was outstanding. The 62C mulching kit surpassed the 60" deck kits by its ability to stay clear during mowing and clean after repeated mowings.
I would not recommend a mulching kit to anyone who wants to cut grass for several months without even looking under the deck. A good mulching kit will turn clippings into such a fine material that it 'pastes' into every nook and cranny of the underside of the deck. The 62C mulching kit is comprised of three blades and heavy plastic baffles. The 60" decks are equpipped for mulching with steel plates and baffles. This is one case where I believe plastic outperforms steel, and where the molded and enclosed plastic baffles will probably outlast the steel baffle plates.
Even if you don't want to add the full kit, you might just try out the stock JD mulching blades that are issued with a mulching kit. They have the extra lift and secondary cutting edge that might produce the finer discharge you are looking for.
Good luck!