Well, I was AFK for most of the weekend. Although I do sorta have an idea of what to post. Amount of damage taken may depend a bit on how multishot works with bows in GBO... if the spread is oriented in relation to how the bow is held*, or randomized.
Horizontal dispersion IRL would be achieved by varying spines (arrow stiffness). and since they all cannot share the same nocking-point, vertical dispersion is a given. Canting or tilting the bow can alter these dispersion patterns, but not by too much.
*If not randomized, then there's going to be some very definate limitations Clem can abuse based on how one can hold and fire a bow in a practical manner.
...
I'm overthinking that part due to... firsthand experiance in archery.
Thankfully, had Kiss-Shot not used the M202 FLASH by this point, Clem would be requsting it while hunkering down in cover and trying her best to regain control over her breathing.