After a winter break, I have just laid the soldier course on my 45 1/2" oven. I laid the bricks outside the floor to give me a bit more cooking room. Luckily, the height of the soldier course above the floor is equal to a 1/2 brick. However, I am finding that my soldier course is not a perfect circle. The question is, should I lay the remaining courses based on the existing inside edge of the soldier course (and continue the non-perfect dome) or, using the IT, lay the remaining courses in a more perfect radius from the center?