I would highly recommend molds than TT70 gears, they are not worth the time you spend on farmimg them. Better farm some coins/chips and get some molds. For lvl 60+ you start getting a lot of choices, and they have def better stats and will last longer than the tt70/80. About weapons, for all classes there's also molds.
Arcane Classes: Sakyamuni's Light
Heavy Classes: Calamity Axes
Archers: Wind and the Clouds
For a higher grade weps you would need to farm low TT's, tho you will be stronger and they will be easier. So in conclusion, please dont waste ur time farming tt70/80 on lower lvls. Focus on lvling, start to worry about gear after 90ish.