The reason your front wheel pushes and washes out in a corner is often not about needing to put more weight on it, it’s more about losing the balance of keeping your weight driving into your tires contact patches. If your weight is falling towards the inside of the bike as you turn more, and your hands are very far from the contact patch of the tire, as is with a traditional low and forward stem, it will be very hard to keep your weight up on your side knobs, and have direct enough feel of the front tire to control the bike if it starts to under steer in a slide. Having too much weight on the front can actually make the bike more likely to continue pushing straight instead of changing direction. This is particularly true in loose conditions. An object in motion wants to stay in motion in a straight line the same direction it is currently going. The more weight an object has, the more it will resist a change in direction. With this in mind, putting more weight on the front wheel can increase down force on the tire for traction, but crucially also increases how resistant it is to changing direction. Moving your weight further back with the bike leaned over further under you frees the front wheel to change direction easier and quicker. Think about the front wheel lifting up. Now think about the front wheel lifting like that but with the bike leaned over. The bike is now basically turning. This is why you will sometimes see a rider rail a tight berm and come out in a brief manual. They are pumping the turn starting centered or maybe even a bit forward, and then driving back leveraging the bike around the turn under them until they can pull back on the bars and whip the bike around the turn.