Just keep at it, you'll probably find extreme mode primals and coil a bit more challenging, even if they have echo there are generally some mechanics you still have to pay attention to.

As for zodiac weapons, consider yourself lucky for starting late on that. Atma RNG used to be terrible, before they upped the drop rate I spent 14 hours in one zone grinding fates without getting that single atma. Yoshi has confirmed that zodiac weapons will grow in 3.1 which is one patch after the expansion drops so I think you have plenty of time to get started. Odds are when expansion hits they'll make previous steps easier in order to expedite the process a little because of the level cap increase, either that or they'll just boost the ilvl for all the weapons.