Arrows too light for hunting?

[SnakeEyes]

Hi. Just looking for feedback. Is my arrow weight too low?  My setup:

-Black Widow KB 45#
-Draw length : 28.5"
-Arrows: Safari Tuff 500sp, 50gr insert, 125gr head

My total arrow weight is 400gr.  I've killed a few does this season with it. Did not get pass throughs. Magnus Stinger Single Bevel head. 

I tried more weight up front and it seemed to negatively impact arrow flight. I'm wondering if I need to get the 400sp, leave them long and add 200gr up front.

Thank you

[EHK]

Maybe it's the head?  Those Stinger single bevels look kind of blunt up front compared to a standard stinger or a zwickey.  I'm shooting longbows in the low 40's with a total arrow weight around around 10 gpp, so not much more than you and with VPA 3 blades or Stinger 2 blades (with bleeders) typically get pass throughs.   

[Terry Green]

If a heavier head wont fly, my  suggestion would be a heavier shaft.

Best of luck.