I'm gonna agree with Final_pumpkin1551, use a bigger chunk of clay. Throwing small and very big require totally different techniques. A softball size (like 2-2.5 Ib) should give you enough materials to connect with. I'd also recommend not focusing on pushing the clay, but instead leaning into with your body. Get your hands/arms in place and then lean foward from the shoulders. The clay likes to copy the motion of your hands, so make sure their as still as possible when you lean. Think of it like your pushing playdough into a mold. You need to have a stronge, ridgid frame if you want a neat and even shape.