SJ - Good Luck. What you describe is typical of "properly" socialized persons.
Here's some reading that may give you an insight into addressing the problem. (I'm not an LEO or a shrink - I have no professional credentials that will withstand scrutiny in a court of law - and that's the advice you need in this professional context. That's why you get the reading list - so you can explain why you did something to "modify" societal conditioning. Required disclaimer!)
"On Killing" by Grossman
"Training at the Speed of Life" by Murray
"Force Under Pressure, How Cops Live and Why They Die" by Blum
All of these also include extensive bibliographies with additional reading. The 
www.armiger.net website also has a link to Amazon.com where some of the more comprehensive titles are for sale. 
Kyobanim does have a point about the advisability of 100% effort during training. I would encourage you to limit "Combat Speed" drills to Redman or Tony Blauer's protective systems. Full power against "friendly" training partners is likely to leave training scars that will negatively impact future street performance.
Just a couple hints. This does not answer your immediate need but it will help the next time you get stuck with this detail. Training, especially for combat is an evolving science. Much of what we thought we knew about adapting normal people for combat is proving to be inadequate. (Actually that's probably more true about dealing with the aftermath. Survival instincts will usually get the average well trained person through their first encounter.) If you can figure out how to bypass the conditioning without creating a bunch of sociopaths - please share it with the rest of us. My .02 - Peregrino