AA Core 6 Master of Imbuement adds +20% Doublestrike which a pure ranger can get but a monkcher cannot. Killer in Deepwood needs 23 ap in that tree which may not be possible for a monkcher as the monkcher may also need ap elsewhere for healing (halfling) and/or passive ki-regen (monk tree) neither of which the pure ranger needs. If the monkcher goes the Elf route even more ap needs to be spent in that tree. Killer is debatable as a difference but Master of Imbuement isnt.
I already did post my suggestion to a solution btw several pages back in this thread thank you for asking. You are welcome to go back and read it if you missed it on your first readthrough. You will notice that I advocate Doubleshot working during Manyshot as well which means that even a modest difference in Doubleshot will be quite an equalizer. Comments are definitely welcome.
Link: https://www.ddo.com/forums/showthrea...=1#post5701337