A little background:
I was MT for our guild for our beginning Kara experience, we picked up a better geared warrior for MT so I moved to off tank.
I also have a rogue so I bring him in for fights where 2 warriors are not needed, the other tank steps out for bosses where I need gear and it has worked out well, we have been clearing Kara on a regular basis.
Recently we have picked up more raiders and have started a 2nd group that I am leading and MT for and things look good as we made it through chess in the 2 nights we ran last week with many that was their first time there.
At the same time we have made an alliance with another guild and have started clearing Gruuls lair (well Gruul doesnt drop everytime) and I usually bring the rogue to these fights but the other tank has picked up his gear and wants me to start bringing my tank now as he doesnt get along with the other groups tank.
The problem is the other groups tank is a very well geared warrior and has been all the way to BT and if he MT's we cannot stay even close to him in threat on Gruul and wipes ensue. If I MT the DPS have to hold back too much and we get too many grows from Gruul.
I do have some rage starving issues in 5 mans and trash mobs in Kara but if I MT bosses or on Gruul the rage bar is full, if I am off tank rage starved.
The question at hand is should I respec or what changes should I make as I am more of an off tank lately except for the kara runs with our 2nd group.
http://www.wowarmory.com/character-sheet.xml?r=Thunderhorn&n=Tremec
Here is my armory link I logged out in the gear that gives me the most defense, I have most of the dps trinkets/rings/neck pieces from kara just no actual armor for dps I usually put on the HH helm and and trinkets/rings/neck and still maintain 490 defense but it makes a minimum difference to my dps.
Any suggestions/advice?