Louis, our pound cakes start with creaming the shortening/butter and sugar, then beating in the eggs, one at at time, then alternating the additions of flour and liquid. Your method is more like a genoise.
Years ago there was a letter in the food column of Southern Living asking why pound cakes were boiling over during baking. One of the answers was that people with KA & similar higher powered mixers were beating the batter too long after each egg was added and incorporating too much air in the batter. The other thing is that eggs vary in size and many sizes today are larger than before. Larger eggs or the use of Jumbo eggs could make the batter run over the side of the pan during baking. The food editor said to measure the amount of eggs and not just the number called for because most recipes calculate 5 large eggs equaling a cup, while 5 jumbo eggs could be a lot more than a cup.
I have the K4C and the K45, both from the 70s and made by Hobart and each makes a different cake batter. The 45 turns out a stiffer batter than the K4C. In the 80s, I had oven capacity and enough Bundt pans to have 8 cakes in the ovens at the same time. I used the two KA mixers for batch after batch of batter until all 8 cakes were in the ovens. I only had to stop to run the bowls, paddles, splash guards and stuff through a fast Light, China cycle in the KDS18 when I changed from a more standard cake to chocolate or brown sugar pound cakes. I had Tupperware containers with the measured sugar and flour stacked up and waiting. I had all of the pans greased and floured before I started to prepare the first two cakes.
The great thing about a KitchenAid vs a Mixmaster or a Hamilton Beach mixer like in our house is that when you start creaming the butter, you don't have to turn the bowl to push the stuff into the beaters, The KA just knocks the hell out of it and keeps the paddle turning.
I have also had great success in preparing pound cake batter in my larger Cuisinart.