You could just use the L&K14 Combat to raise your luck, and walla, 10 more luck for you

What do the LK's have to do with Yasha? If the logic is: "They raise Lck, therefore allowing you to find more rares", allow me to quote Kefka:
"Luck affects Critical Hits only."
Suggestion: Create a sticky topic with all the really rare weapons in. I'm aware that no-one ever looks at sticky's, but it's worth a try, right?
Ah, Yasha, the favourite weapon to annoy people by not finding it...
Its going to take a while to find, so dont worry about not having it right now lol.
yea Yasha is a hard hard hard hard hard hard drop but you can still try.. good luck on that!
Well you have your drop charts and responses, I'll just see you in 5 years when you find one.
If you want a Yasha go for it and Good luck
For me i will wait until i find a Sange before i join you in searching
I'm sure it's possible someone can get the Yasha after only a few kills. but if that does happen, they're really, REALLY lucky...
I hope I'm one of those people, I wouldn't mind having a Yasha to go with my Sange

Its possible to get it on the very first Indi Belra or Melqueek, you would just need an insane amount of luck, thats all.
Didnt happen to me though.
They gave me a photon drop on my 3rd run, which was nice *sarcasm*