obviously for tempest 2, kensei 1.
2 rogue levels comes to mind but attack rating drops.
is a 1 cleric level for more sp, bless and divine favor a good idea? (also divine vitality and if you are using longswords plus 1 from sovereign host too) i don't know the duration of bless and divine favor though.
or a wizard level for extra feat, possibly empower healing? detect secret doors, jump, masters touch to use other exotic weps you might loot randomly but can't use normally?