Why does there seem to be a lot of mixture left on the sides and the bottom of the bowl?

The bowl tool may need adjusting. There is a nut located at the top of the K-beater, whisk, dough hook and creaming beater.Using a spanner, loosen this nut and you will then then be able to adjust the length of the shaft up or down. For the best results the attachment should be as close to the base of the bowl as possible without actually touching it. When you have found the required position, tighten the nut back up. The Creaming beater is perfect for mixes that tend to stick to the side of the bowl more and can be purchased separately if it was not included with your pack.