Hey guys, short update:
Spoke to the devs, and the higher enemy spawn rates for 1.04 are intended. 3DS, as with mobile, got the spawn rates matched to PC with the introduction of the Expanded Worlds. So if you're noticing an increase 1.03 to 1.04, that is intended. If the PC guys are seeing spawn rates that seem high even compared to PC, then that is potentially an issue. We're checking the code now to make sure nothing weird is happening, but definitely eager to hear from the PC veterans in the light of this new info.