What about relics?
Best relics is now new PvP ones, cuz Bolster count expertise on them *as is* and dont *bolstered* to up level. Get them first.
Since I had 2004 expertise before I even started getting Conqueror/Partisan, or in other words 2018-14, or -1 expertise per piece of gear, I don't think this is correct. I take an expertise penalty if I unslot my relics altogether and leave them empty, or if I use old war hero relics that already have expertise on them, but as long as I have any old non-expertise relics there, bolster seems to bring them up to Conqueror/Partisan minus 1 expertise. For the record, I'm using a matrix cube and a light side relic.