As I've already stated, I LOVE these types of conversations. The catch is that even trying to manipulate the standing stock just isn't an overly worthwhile endeavor for I'd guess more than 10% of us. There are just so many more things that will deliver far more results for the majority of land/deer managers out there...And nutrition is a big one. You want to see the biggest jump in antler quality? Figure out what the nutritional stress points are each year and make sure you offer ample, top end nutrition during those phases, while also making sure you have plenty during the seasonal nutritional high points (often one is fine there as is, but a little boost often doesn't hurt either). Do that and rack sizes are likely to take a noticeable jump.
The other painfully obvious one is just getting age on bucks.
Most with a 20-200 acre property will never see a benefit from trying to shape the standing stock. Heck, many are thrilled to have a, any 3.5 yr old buck on their ground, period. If you're lucky enough to live in an area with decent-great buck numbers and age classes, that's still typically not enough ground to see a noticeable impact. The smallest I've managed that I can honestly say I believe I saw an impact was a piece that was just shy of 500 acres.
That's a long way of saying that I love this topic and find it incredibly fascinating, but trying to manipulate the standing stock is probably the least important thing one can do on their grounds for at least 90% of the managers out there. Set whatever age goals you're comfortable with, hunt in a low impact manner, offer the best food, water, breeding and feelings of safety and comfort. Do that and everything else generally falls into place for most landowners. You can/will see tangible benefits from those steps, but most likely won't by shooting a weak racked 3.5 as opposed to letting him go another year, UNLESS your buck numbers are too high on your ground and bucks are getting their daylight core areas pushed to the neighbors because of it. Most just don't have that issue.........and most won't feel sorry for you if you do, as you already likely have the best hunting in the area.