I had my fitting session with Tim Mosel of Denville, NJ yesterday and the amount of information I received is staggering. I'm trying to digest it all but it was a very, very interesting experience. Without going into a long drawn out narrative, Tim is going to make up a customized "test club", a 6 iron based on my swing characteristics and the numbers generated by his computer simulator, that I'm going to pick up next week and use for as long as I need to see how it works compared to my current 6 iron. Bottom line relative to my originally posted question is, as several other posters surmised, it's not at all cost effective to optimize my current X-14s, mostly due to the bore through hosel design which makes shaft replacement extra labor intensive. The good news though is my driver and 3W are already perfectly matched to my swing.
I'm sorting through all the data and recommendations. It's a process that will probably continue through the fall and winter at which point I'll make some kind of decision then. Tim is a Tom Wishon certified fitter, so I'll certainly give strong consideration to those clubs and get a set of irons matched to me, especially since the cost of a set of Wishon's is actually somewhat less than an off the shelf set of Callaway's.
It is not hard to keep my level of play these days as it is not a high level anymore. I play three times a week with no range time at all. I no longer play in tournaments and the only play is with my wife and what used to be two friends. Both are now physically unable to golf so it is just the wife and me. We play for the exercise and just being outside and to enjoy the tree lined course we play 3X a week.