I went to a two week cfi school and took the check ride. Thankfully my CFI ride was my easiest check ride I every had. I have heard horror stories of 2 day check rides. Sounds to me like you should be ready. 4mo is a long time. The hardest part of a CFI check ride is the oral. The flying part you should already know other then teaching from the right seat. Sounds like you need to have a heart to heart with you instructor or find another one.