You still want it to be flat. I started adding in my beer after the lye because I use a beer from a local brewery that no matter what I do it will still volcano if I add the beer to lye. I have boiled it, frozen it let it sit in the open for 5 days and it still likes to volcano. Now I am just in the habit of soaping with the 50/50 lye and adding my additional liquid after my lye is added. You do not actually have to use 50/50 water and lye, you can use more water in you lye just figure it into your total liquid requirement