Spoil/drop rate for cbp recipe?

[Lazy]

Wondering if the spoil/drop rate for cbp recipe is right? 

Made 5 dwarves spoilt from lvl 5 to lvl 15 and got none ( lots of full drop bows)

Made a 6th and try spoiling while in a party got it but still needed to spoil from lvl 5 to lvl 14 in a party.

With current OBT rates so high, just seem odd to me that this lvl 1 mat recipe can be so hard to spoil.

[Banish3d]

Maybe you didn't spoil on the right one, on classic you can spoil this recipe on Utuku orc archer (8,226% - 10,064% chance with x1 rate) in Western Mining Zone (Dwarf area).

[Lazy]

thanks for the reply and sorry I didn't write before that I "only" spoilt that mob from lvl 5 - 15 on multiple characters.  Hence it was odd to me that the rate was that bad. And the 6th time I even tried doing in a party just in case it was not possible to obtain while solo, because I noticed the spoil often yielded nothing at all while I was solo, and only occasionally the leather stocking recipe x8.  I got so many full bow drops from the many tries that after selling it all I could buy a top no grade blunt >200k.  Seems hard to believe my luck could be that bad when the full drops were so many.

So just wondering if anyone else tried recently. Also wondering if it's a party only spoil.