It was after a bad experience that I decided to keep the flask cool.
...and I explained it to you in that thread. It got hot because it is starting to break down. You can do this reaction any way you like and learn the mistakes the hard way, or you can take my advice. Mixing the performic and stating addition straight away is fine and showed no loss in yeild.
As Abolt stated, without a reflux column, you will lose DCM. Who cares it is still doing it's purpose by evaporating, cooling and controlling temperature. You can run 500gm in a 3L RBF and the DCM loss is about half. Note that a water bath is used but only with room temp water as to be a heat sink but not cool/slow the reaction. The reason for all these shenanigans is the ability to use very strong overhead stirring via a drill press with paint stirrer (S.S shaft coated in teflon tape with teflon paddles) in it. The use of a room temp water bath allows for fast addition, and although there could be a delayed thermal reaction, it seems that the use of very good overhead stirring solves many problems.
Sorry about the (by weight) yeild, at least I stated it! Besides, what's worse, my laziness to convert it or yours? It was about 73% /mol! >:(