Olaf i wouldnt recommend for a split push type. Pure ad builds are better at pushing. Such as noct, i build him pure ad and have 62% win rate on him. Ive come back from many games purely by split pushing and winning it on my own. I dont need my team to win i only need me to win, i easily 1v2 people and 1v3 when fed on him, by getting kills/cs.
If they are usually pushing on your side of the map its better to ward passive, which is warding in your own jungle. If your team is always pushing then ward aggressive in there jungle. That is how i tend to ward. If there pushing into you, warding there jungle isnt going to do anything if your dying in yours. If your pushing into them warding your own jungle is pointless cause they wont be able to go into it, better to ward there jungle and easily get picks. If you want to do baron ward there jungle around baron, so you can see them coming, also ward the river bushes for full vision. Though you'd need more then 1 person to ward as you should for that.
Objectives win games yes, but there is a limit to how much gold objectives give over kill gold. An average kill gives 300 gold, so if its like 5 kills for every tower its not worth. Baron gives 300 gold to all, and dragon gives next to nothing beside passive.
I feel dragons are pretty bad, the only ones that matter are first and 5th. Most people tunnel vision on dragon and think they are so important when really they arent. If you can trade getting towers for giving up a dra unless its 5th drag then its worth to me. Id much rather towers over dra. The first dragon is only useful for carries as well. If your a tank 3% ad/ap really aint gonna mean anything at all. So if you have a very tanky team dra is even more useless.
People in bronze give up so easily because they are bronze. Bronze mentality is basically "i get first blood or i ff" they give up really easily which makes it even easier to win in bronze. If you cheese someone(depending on your role would determine how to cheese)and succeed, which in bronze it is a lot easier to do, then your a lot more likely to win the game, because it will rasie the moral of your team and lower the moral of the other team. Cheesing to lower moral doesnt work as well higher elo because they dont give up so easily, in low elo its an easy way to win early.
If you would like you could add me in game and i could spectate your games, theres only so much anyone can tell you without seeing you play :)