You might not like the answer, but it's as simple as that:
Lower the difficulty.
Torment 13 isn't efficient by any stretch of imagination, even for insanely high-geared people. With your paragon, gear, and gem ranks (not even rank 50 gems!) you're just not ready for T13 yet. Especially since you're wearing In-Geom, you really want a difficulty that you can "faceroll" to make sure that In-Geom is up 100% of the time.
I don't see anything wrong with your build. I'd probably use Goldwrap in cube instead of Laws of Seph, then you can switch to Epiphany-Insight (to make up for the spirit loss) and possibly even give up Agility and so on. But in general this build (like so many other monk builds and every In-Geom build) highly relies on one-shotting stuff and almost instantly killing elites. If you're struggling, go lower. T13 is super inefficient anyways, you'll get much much much more DBs, keys, and loot by going lower and killing faster.
http://eu.battle.net/d3/en/profile/Mortem-2292/hero/81334097
any smart heads out there?