I was on a ranch in South Texas hunting for a few days over a 2 week period. They had good rainfall this past year and above average rainfall. They had more broken tines this year than in the past 3 yrs according to their biologist/manager. This ranch has a 1 to 1 ratio in Oct and was more like 1 buck to 2 does when I was there. They had been taking off the lower end of the bucks. I saw and took pics of a lot of bucks with broken points to whole sides broken off. I witnessed 2 fights in late Jan. Saw a few does being chased by bucks and saw a lot of doe fawns being chased around.
I have seen just as many broken antlers in wet years as I do in dry years. IMO I think the lack of rain(on unfed/no food plot ranches) causes antlers to carry less mass and break easier. On the opposite, I think in wet years you see bucks carry a lot more body weight and that adds leverage in fights. Results in more broken points. I also think they fight a bit more in wet years due to doe fawns getting large enough in body weight so that more of them are coming into estrus. More fighting equals more broken antlers. Here on my little place, I see the same amount of bucks with broken points in dry years as I have in wet years. I feed protein(not every buck eats it yet) year round free choice and have food plots and still see broken points. One place I managed was the same with broken points on bucks.
I think that the mineral package in feed is the key to heavier(by weight and circumference) antlers. But in the end when you pit two animals together with only antlers at the contact point, throw in the shear force of their leverage....something is going to give or break if they are fighting long enough. Lot of power behind that leverage if you have ever had the chance to watch to bucks fight. They are not playing with each other, they are trying to over-power or kill their competitor.