definitely get better tires if you're riding agressively
but... if you aren't bottoming out, the forks don't need more preload. adding preload where it's not needed will make them worse at being able to recover from traction losses.
i experienced similar issues with confidence on the front in turns and also blamed the bike before someone smart set me straight. turned out i was doing it wrong
what exactly do you mean when you say mushy and unsure?
when you're full tilt mid turn, what's your input like? are you trying to correct the line when it feels "mushy"? whats your throttle like? off the gas? coasting? trail braking until the apex then on the gas? how are you positioned? is your weight completely off the bars? how about peg weighting? outside? next time you're riding try to pay attention to where the bike's weight is going when you're maneuvering. how much weight is on each tire?