RE: enough k- energy?
Nicely put,the numbers don't kill the animals.
Well tuned arrows and imo,the ACC is a great choice of arrow for low energy setups.They are not heavy,as many think is so crucial to penetration, but they react well to impact allowing them to penetrate extremely well.
I also agree that a cut on contact style head would be best suited for low energy setup.
Another good choice imo for low energy arrows are the AC Kinetic II's from Easton but I have no actuall experience with them.The Axis arrow should do well also.