I have the 23-13 and use the schedules I got with my evenheat pro. I have found that the 23-13 fires hotter by about 30 degrees.I am working to adjust the evenheat pro schedules to work with the 23-13 but haven’t perfected yet. I haven’t had any devitravacation problems. I haven’t tried it but the manual for the 23-13 says you can use ther sides and turn the top off. I think it’s under “other”. Hope I was able to help.