I am exactly you. I am on my 4th pair of Tempus after being brooks guy for years and years, and they work great. However, I wear them for the stability they provide. The endorphin line is more neutral and lacks that support structure for an overpronator. I'm not saying that you couldn't adapt to them but you will have to decide if a month is going to be long enough, presuming that you eased into them first. If stability isnt your issue then you might be just fine transitioning to them.