Know plenty of people say no lids while boiling, but I think it helps keep a good boil going. I sourced a dead keg from a recycler, small dents, and a stainless wok lid from salvation army. I was thinking that any steam would roll down the wok lid due to the dome shape, and down the drain holes on top of the keg, keeping DMS from dripping back in. Am I missing something, it seemed like an easy solution, but I haven't seen anyone doing it?