Atlasman,
I, too, have a short drawlength (27" ) and have spent
a good deal of time looking into my KE. I currently
shoot a Q2 @ 65 lbs and ACC arrow @ 395 grains.
My arrow speed is 250 fps and my KE is 54-55 ft-lbs.
With this set up, and others in the past (that had much
less speed & KE) I' ve had no problem getting
passthough' s. Heck, I got a passthrough on my first
buck years ago, with a 2-wheel bear bow set at
56 lbs. I' ve taken all my deer with 100 gr. fixed
blades- Muzzy, Wasp SST, Thunderheads, and
Rocky Mountains. The only buck I' ve lost happened
when I used a Spitfire (1-1/2" cut) several years
ago, at the time I didn' t even know what Kinetic
Energy was! At the time I used the Spitfire my
KE was 41 ft lbs[]........right then and there I
promised myself I would learn more about my
set up and what I needed to do to improve it.

Find out what your arrow weighs and figure
your KE....everyone should know this.
Unfortunately, it' s not as simple as just changing
your arrow(s) and/or arrow weight. Like
others have said, your options are:
1) Buy a different bow that stores/creates
more energy than your current bow
2) Turn your bow up

I' d recommend a quality 100 gr. fixed blade, there
are plenty to choose from. Find out which one
flies good from your setup and go with it.
Make sure your bow is tuned and your arrows
are flying straight....you should have no
problem at all getting passthroughs.

This site may help you:
http://www.bowjackson.com/

Best of luck,
Two Beards