"Ha! Ha! Ha!"
After 10 days of trying, I finally succeeded in creating Purple Lightning, Shiden.
Rubbing and sliding my chakra from the start was the key, instead of running back and froth.
For its sharpness to pierce things, the jutsu is such that the tip constantly has higher potential, leading to the free negative charges moving towards the tip at great speed.
So, I don't need to run myself now for gaining the same piercing power as Chidori.
There is a problem of magnetism it causes, but I have solved the issue by replacing the iron in forehead protector and forearm protects with titanium.
So, the problem will be for opponents whose equipments will get attracted to my attacks.
As for kunais and Shurikens? They are made of Iron, and stainless steel isn't cheap yet.
So I made seals on handbands like Sasuke did in the fight against Itachi.
Taking a break, I started studying fuinjutsu.
I don't need to learn everything, but some important things like Four Symbol Seal, Five Symbol Seal, Contract Seal, Summoning Seal, and most importantly, how to use fuinjutsu with handsigns, and fast at that.
One of the main difficulty in learning Flying Thunder God is to swiftly apply it's mark with just a touch, without even any handsigns.
Once that is done, it is basically a modified summoning jutsu with ourselves, in reverse. So the mark summons us, not us summoning what is marked.
...It's complicated.
Anyway, for now, I don't need to rely on Sharingan much because I have developed Shiden.