Mfamom, having dry bits unmixed is an adjustment issue. I recall when mine was new this is addressed in the manual. it has to do with how low the beater goes into the bowl, and can be adjusted. Something about my mixer(about 9-10 years old now) seems a bit loose, and I had this happen for the very fist time ever, with a very stiff cookie dough. But never before. I am sure I need to service or adjust something after th e10 years of heavy use i have got out of it.
Ra3, I love my kitechenaid mixer. it has the 4.5 quart bowl and is 375 watts, called the "artisan" on the side of the machine. I got it on sale about 10 years ago at Macy's. There was a sale, then an additional % off and a rebate going on. You can watch for those deals at your local retail stores, I am sure.
I usually use it for very thick cookie dough, and even mix in my chips on it. I have done a pizza dough a few times, but honestly, mostly do cookies. At the holidays, I will mix as many as 3 batches in a day.
It is heavy, and I cannot fit it under any cabinets. I was burning through a hand held mixer yearly at the time, so it has paid for itself. I do not have to do much scraping at all. Sometimes, with a wetter dough, but not much with my cookies. Once th eflour gets in there, it grabs the sticking batter off the sides and mixes it in. I have weak hands and some arthritic issues in my hands and this is a must for me t have if i want to bake for the kids.
I love it!