Entering so called endgame. Any tip?

[lxSch]

i80 is not useless on your main, unless you are full i90 geared (which isnt the case here). Its better than Darklight (i70) and costs you nothing + you get currency for i70 + i90 gear while you are getting i80 gear.

But 1 CT run does not mean 1 piece of gear for you (per week), and you need 9 CT runs to cap weekly myth, and i80 gear will be no use in 2 months after gearing in i90 (or even sooner if 2.2 is installed before that). Also lv50 dungeons will teach how to play your role, while in CT many people are carried and learn nothing. But for alts CT is good, because almost any drop can be useful for them.