hi ,you right about floating objects there are to many lights and the scene is bright,build time is going to became my nightmare,yesterday morning i clicked on the button of build(with some horrible value for baselightmass) and left the home for an outdoor climbing,i came back at midnight and guess what it was stuck on 1%
but i will keep testing until i get those sharp indirect shadows,have you seen the london apartment from ue4arch?the shadows are unbelievable.i cant believe they reach those shadows with ue4.