Does it make sense to have mobs die so quickly?

[Peregrine]

NOTHING gives you 383 sp in a party of 4 at rank 27 save for an easily-exhaustable quest mob set. You underestimate the inherent differences in sp that each type of mobs give at a given dlvl cap. The 35-39 ranges of mobs is a deadzone of sp per hour, because there are no options but low-sp yielding enemies. There are no raptors, efts, beastmen, eyes, peistes, fireflies, or the like. There are at best dodos, which are about the middle of the pack in terms of sp.

Ants give about 250 a kill, and are about your best bet. Ands are sub-par SP targets by design, but they have the most density by far.

Not every R35 mob gives the same amount of SP to a R27 player. In fact, the differences are huge.