Im posting this for one reason and thats from reading the words "Count your shadows and dont rely on your shield."
A PLD that doesnt know how valuable his shield skill is, is not a PLD at all and should seriously reconsider the job. Please dont tell me your a blue berry adaman feet PLD? That has no clue how valuable his AF boots are, and wastes gil on shitty boots when he has FREE boots that are second to only their HQ version.
I really liked what Hito had to say aswell Props to you man.
Anyways back to the serious matter. Posting a pic of my different setups for my PLD that I use to tank in sky.

TP>>>>>>>>>>>>>>>>>>>>>> Ichi >>>>>>>>>>>>>>>>>>>>>>> Ni
My first set is my "Idle" TP build set I use when shadows are up, mostly haste and ACC gear to build up tp using Joyeuse for Atonement spam, if you dont have Atonement yet your better off using Chainsaw +1... dont kid yourself your not a DD and you'll be hitting for 0's constantly on gods and that +4 Enmity highly outdoes any dmg you can do with vorpal or swift blade.
My second set is my Ichi recast build and I cant STRESS how IMPORTANT your shield skill is for Ichi, if you dont have your shield capped do everything in your power to try and cap it, if you dont have shield merrits get them. I WHORE out shield for ichi, I have a total of 321 Shield skill for my Ichi Recast, speaking with a few aegis PLD theoretically if you can hit 350 shield skill youd be on par with Aegis. The reason being you will run into situations (Byakko's tripple attack) or (Seiryu can use his breathe, silence you then double attack wiping your shadows and ni could be down, leaving you only with Ichi) where your recast timer for Utsu:Ni is down and the only thing you can cast is Ichi, There is only one thing that CAN and WILL get your shadows back up and that is your shield. Throw on as much shield skill as you can and then haste on the spots that you wont sacrifice shield for. With Haste and Double march your timers will still be efficient enough for recast, I sit on 10% haste for Ichi recast, Askar Manopolas 2% (Dusk would be better 3%, im working on Homam), Homam Cosciales 3%, Swift Belt 4%, and Blitz Ring 1%, if you dont have homam pants you can use PLD relic legs aswell the 10% intterruption rate is nice and will help you get your shadows back up. Fast Cast gear is also nice to have it will make ichi go by alot faster and help get your recast down aswell, and probably makes up for the lack of haste with all the shield gear you are using. I sit on 14% Fast cast and my ichi timer flies like crazy.
I use champion's gallea with +5 Shield and +3 Fast Cast for Ichi recast, alot of good PLD will use Koenig helm I made my augmented head as an upgrade to that, if your the main tank in your LS Get Martial Head right away, Koenig helm is one the the BEST pieces of gear a PLD can have, the +5 shield from that helm is godly not to mention the defense and VIT that comes with it. Also your AF boots are complete win they are the BEST feet a PLD can use, only thing better are AF+1 boots which you get from limbus. Homam are nice but only for TP and casting Utsu: Ni, if you can get askar those are good for TP or Kiting, but homam are still better for TP.
Examples of good Shield Gear: 10 Gallant Leggings, 12 Gallant Leggings +1, 5 Koenig Schaeller, 7 Shield Torque, 3 Buckler Earring, 10 Boxer's Mantle (Has Parry with it as well), 5 Knight's Earring
Finally my third Set is for Utsusemi: Ni you want to whore out as much haste gear as possible, as you know Ni flies by and yes it can be interrupted but the chances of that happening are alot less than Ichi, a good PLD should be sitting on 15% haste for Ni... your using Dusk hands and feet thats good until homam, just try to get yourself a swift belt as soon as you can it will help out alot, you can get a blitz ring too to add another 1% of haste, thats not really a necessity though.
You dont want to use your Jelly ring tanking gods either... they have enspells with their attacks which will hurt you hardcore with that +5% magic damage taken, also im going to have to Disagree with Hito even though I liked what he had to say, dont use Hauby... your not a DD stick to your Nuevo body for TP its a good piece of gear, I use Avalon to Build TP (I assume Hito does too looking at his Signature?) but its not a necessary piece of equipment, that is up to you if you wanna spend 8mil on a body just for ACC, I like the +15 ACC for atonement build.
Check this Link out on Wiki
Thycian PLD/NIN Guide this guys got a good PLD/NIN guide and alot of different pieces of gear that explains how they can help you out, it should give you a good idea.
Or if you have any questions on what I said feel free to ask or send me a PM ill be happy to help out.
-Gradd