I think we look a lot better all over with 3/5 at the back. The system suits the players we've got currently - 433 or whatever the official set-up puts Lookman and Barkley out wide- both would benefit more from playing in natural positions in a 532.
For me our best line-up currently is...
..............................Joel................................
.......Holgate.........Williams........Mori...........
Coleman...........................................Baines
.............Schneiderlin.........Davies................
...............................Barkley..........................
......................Lukaku........Mirallas...............
Gueye, Lookman, McCarthy and Barry all could slot in and replace when that team needs rotating and freshening up.