I've been farming 2-12 since I figured this would be the stage that would give me the biggest bang for my buck.
my reasoning is that the r tools will give me more patk or matk and their item lvl would give me around 300+ more power, allowing me to play some 30k+ stages with the overpower buff.
The results feel a bit lacking, the weapon only gives me around 20+ atk compared to my current axe and it "feels" it provides less dps overall but with more attack it shouldn't so it may be completely subjective, the weapon had two magic substats so maybe a weapon with more physical substats would make a difference.
I still had some sfty laying around from the abyss invader and events so I'll use them to awaken elena, hopefully the atk and hp would help me clear the lvl 3 shard abyss.