For those non-myth, non raid guardians one of your main issues is roughly 80% of level 80s have their Myths on "most" servers. IF you are running around in Leg/Quested gear you can not expect to hold any agro against a Myth DPS class, who has some fable, which many 80s who have been running TSO for months have by now.
Your best bet is find a group of friends(though server populations suck and there should be mergers) who you can hang out with and progress yourself. Once you are 80 farm some stuff from RoK instances and quests, then do starting zones for TSO such as DF,Scion,NHT,Befallen,evernight Abbey,etc... You will "eventually" get your T2 shard gear and can start progressing the x2 raids easily.
Find a good dirge and templar or warden to be your buddy, and you can create any group from there. You are a tank, you dictat your groups, people expect you to lead them, do it. But do it nicely 
TSO was not created as a way to bypass RoK content, it is a progression. You will not need your Myth for TSO but get your Fabled version, it is easily attainable. Rememeber adorments help also. We do have to work harder then the other tanks atm, but just hang in there, our time will come once again. One expansion of this game on the bottom for most guards is not the end.