Did a bunch of mods to smoker. I replaced chip box with cast iron skillet. I also cut 1 1/2 inches off rack that holds skillet to get it closer to flame. Takes forever to create smoke. Once it gets going it does well but when i add more chips it takes takes like 10-15 minutes to start smoking again. Is anyone else having this problem or is this normal? Seems like everyone has replaced chip box with skillet. Should i use a lighter skillet instead of cast?