Just an FYI my stam blues are because I was breaking hit cap so I replaced them with the next best for that slot, and mastery forging was a "better than nothing" trying to shed hit/exp/haste since I don't do the 15% exp cap. So my profile may look a little weird but it's not choices made cause I do 25m.
I did clear our first Lei Shen kill with a Stam flask + LW wrists but it wasn't really needed, just didn't want to have a wipe result from me barely dying in an "oh sh*t" scenario like getting 2-3 big adds to tank + boss or something stupid.
Actually was amazed how well BrM can hold up as we had one attempt where I had to take 30+ stacks in P3 several times (getting them bop'd off) as other tank died almost right away and only died after the raid was exploded anyways.
Oh and BoP doesn't clear your stacks but if you get it right at the end of lightning lash it will give you those last few seconds you need before /cancelaura to clear it.