Ignore the advice about the Guard Glyph. Yes, you want to use it when you're fighting a boss with heavy magic damage. No, you do not want to use it for its healing effect. In a raid, the extra 30% healing from your self-heals mean nothing when healers are dumping heals into you because you're not using your defensive CDs properly. Your priority as a tank isn't to boost your own self-healing, but to do what you can to mitigate as much damage as possible.
Here's the trick with guard: it scales with your Vengeance, the AP boost you get from getting whacked as a tank. While you have low Vengeance, it will absorb a piddly 70k...but when you're rolling 100k or more Vengeance, suddenly it absorbs 2-300k. Solo tanking Heroic Wind Lord and all his adds has netted me Guards of a million damage before. Knowing WHEN to use it will set you apart from the bad Brewmasters: use it to soften a blow of a predictable hard hit, like Tsulong's Shadow Breath OR use it immediately after that hit, when your Vengeance skyrockets and you immediately stop damage for five seconds while your healers casually get you back up.
Also, ignore the advice about Shuffle. You want it up as much as possible. You're aiming for 100% uptime. Shuffle is your armor. It gives you mitigation equal to plate tanks and so you want that to be up as much as possible. It's much easier now that the Chi spells have had their costs removed.
Some immediate gearing suggestions: all those +stam gems and enchants? Lose them. You don't want to be gearing straight stam ever, unless you're doing 25-man Heroic content or content which you're woefully undergeared for, which you're not. You want your haste to be at a comfortable level (for me, it's ~6500). The talent Ascension gives you a little leeway in that number. Don't be afraid to stop aiming for 15% expertise until you have the gear for it. It's a controversial subject, yes, but I found my survivability shooting through the roof when I went down to about 8-9% when I was at your gear level and put all those reforges back into Haste, Crit, and Mastery.
Regarding the two bosses you specifically mention: Lei Shi is not a fun fight for us. We cannot stagger any of her damage, so we take it all. Other tanks have this problem as well. A couple of tips: spec into Diffuse Magic, the Guard Glyph, and Zen Meditation. The latter will not break since she only does magic and you can ride out an entire protector phase with it up.
Where we shine on Lei Shi is on add control. Have your cotank take her when she bubbles (yes, she can still be taunted while immune) and you collect the adds. Keg Throw and kite them forever while your DPS burns one down.
Tsulong is a heavy magic damage fight with very predictable damage. Zen Meditation and Diffuse Magic for the breaths.
The key to being any tank nowadays, especially monks, is knowing what is coming and planning for it. The days of eating everything and having your healers fill you back up are long gone. Think about the fight ahead of you: is it heavily magic or physical? Why glyphs will be useful? Dampen Harm or Diffuse Magic? I need to survive three breaths before the next phase, which order should CDs be rolled in.
Edited by Meixie on 4/3/2013 3:52 PM PDT