What Chip, YJ & Lonnie said... Hell, Jim should have his own sub-forum populated with his 123,867 or so posts of wisdom.
I played the L79 Rocketbladez and found them to be very fine irons.
The L90 R11 are so precise and hold/spin so well with good balls they should almost be banned, IMO. I love them clubs!
Then again, I'm just fine with shooting rounds in the low 30's. (Almost) No restarts, no need to shoot low scores, no pressure, no hand-wringing when I lip-out 3 putts per 9 holes. Anyway...
I picked a single ball - in my case the Nike RZN provides me with the characteristics I like. The L48 Nike works just about as well in my book, for 150 fewer credits and 1/2 dot less feel.
Then, I mapped shots in practice rounds with every club using no spin, backspin, topspin.
Maybe I'm dense, but I was surprised that the yardages are significantly different from the tee versus off the fairway. Then there are the various lies in the rough and sand to catalog.
Then there are all the different shots around the green. Oy!
I play very few rounds these days, so the charting process is left unfinished, But I have most of the info I require to shoot scores I'm contented with when I am able to play a few rounds.
All told, it has taken a lot of practice to produce a chart I can rely on.
If there's one comment I read over and over that truly makes me scratch my flea-ridden head is that players sell their old clubs right after upgrading. I still have my Rocketbladez and break them out once in a while for a change of pace. To each his/her own!
Good luck and enjoy!