Currently I use
head: genji
body: tome
hands: tome
belt: tome
legs: genji
feet: tome

The pieces that most people seem to change a lot are the head and legs. Some seem to like a crit build genji head and tome legs, while others like a tenacity/det build with tome head and genji pants. Both seem to be able to parse high so it probably makes such a little difference on which is actually the best. I probably don't need to worry about it since I already beat o4s a couple months ago. Not worth spending more tomes on to change my gear slightly.