This is a delicate area because it's easy to step on toes but IMO your priorities are out of wack. Just how "perfect" do the racks need to be? I don't see anything wrong with the rack on the buck you posted, except maybe his inside spread isn't wide. It seems the left antler slants in (a classic diamond shape) where the right is more upright. If that is the case and it is the "flaw" that you want to eliminate than I humbly submit you're hunting for the wrong reasons and should think of "culling" the wrong motives in your life. It does seem you seek a designer buck and the best option is a high fence and stud fees. If I'm wrong ignore this post.
Now I can understand the case where the buck has only one antler but as mentioned the doe could be carrying the gene as well and there's no way of telling which doe has what genes.
Including the neighbors, there are around 500+ acres that participated in our "program". I saw the results. Coincidence? Maybe, but I doubt it.
Probably the main impact is more bucks are reaching older ages.
Many abnormalities we see in the field are temporary in nature. An
abnormal antler(s) should not be an excuse to harvest a young buck, particularly if the abnormality is injury related. If given the chance to grow another set of antlers, most bucks revert to their pre-injured form and grow a larger set in response to their advanced age. I know of one 3 ½ year old buck that injured his antlers early in growth and ended with 6 points on 2 deformed antlers. He scored far less than 100 Boone & Crockett points (probably closer to 50 B&C). The next year he was a symmetrical 10 point with a 21 inch inside spread and scored 145 B&C. It's amazing the difference a year can make.
http://www.whitetailstewards.com/articlesonsite/deerbiology/antlerabnormalities.htm
Doctor Kroll's book points out that antlers change year to year and it's hard to determine what a mature bucks antlers will look like.
http://www.texashuntfish.com/app/view/Post/12775/Antler-Development-in-Free-Range-Bucks-by-Dr-Kroll