As promised, this video showcases the journey of how I enchanted the best weapon in the game from +0 to +16 (time lapsed 2x speed). This was the most fierce battle I have ever had with the RNG gods, but I came out victorious! A Blackstone count is included at the end of the video. The weapon being enchanted is known as the Kzarka (Kzaka/Zaka) weapon, Legendary Feather Flinger, or simply the Kzarka Longbow.

Strategy used:
+7-8: attempted at +5 fail stacks
+8-9: attempted at +5 fail stacks
+9-10: attempted at +10 fail stacks
+11-12: attempted at +15 fail stacks
+12-13: attempted at +15 fail stacks
+14-15: attempted at +25 fail stacks
+15-16: attempted at +30 fail stacks

You could already see me start to hesitate at +11 as my maximum durability begins to drop. I thought I played things pretty safe, but the real up-hill battle began at +12; things got really messy. I based my enchantment strategy on how I enchanted my Liberto (blue rarity) to +16 and ended up underestimating the success rate of equipment with yellow rarity. Then, during the +16 attempt, I forgot to swap my title back for the first two attempts. Live and learn.

Music Credits - I don't own any of the music in this video all credits go out to the following in the same order as they appear in the video:
1) Daniel Peppe, Jon Collyer - Power and Elegance
2) Spider-Man Main Title - Danny Elfman
3) Daniel Peppe, Jon Collyer - Power and Elegance (I used this one twice)

__________________
If you have a question, please take the time to read through the previous comments and replies. I take the time to thoroughly reply to each question. I appreciate your interest, but I will not reply to repeat questions.

Video of me killing Kzaka:
https://youtu.be/q-ejrtEqKRU