Ok, i finally got what i deserved from the yetis.
A level 60 glaive with str 1 increase, crit 10, phy att power 90%.
I added a str stone... phy att power 90% > 68% assimilation

and str 1 > 3
Tried another with 20% : str 3 > 3 assimilated the crit to 2
Then failed 3 crit stones, 2 durability stones and 2 int stones.
Got +3 first try, went for +4 - failed. Back to +3 after about 10 elixers.
Question time :
What else could i add to it for it to be good? (screenshot coming when i get back to town as its in storage)
How hard is it to get the crit good again?
Should i try and increase the phy % or leave it at 68% as that is quite good?
Should i keep trying for +4 so i can astral and then go for +5?