How to get more drop?

So based upon a post made ages ago by Coggan or Ashburn, I slammed my Chron’Alu last week. The drop was ~4cm and is now 10.5cm. Based upon a few trainer rides, there has been no change in power output. Short term comfort fine, long term comfort TBD. I’d like to try to go lower, but I’ve reached the physical limitations of my set up. What is the best/cheapest way to get 3-5cm more drop? I calculated a -17* 110mm stem would get me 2cm.

What else should I consider?
Does anyone use a more aggressive stem than that?
What would different bars do for me?

Current setup.
53cm Chron’Alu.
no spacers, but it does have that 15mm cane creek tapered upper bearing cap.
Deda 90mm 8* stem
Profile Design Air Wing OS Base Bar
Profile Design Carbon Stryke Ski Bend Extensions (no spacers)

Seat height 75cm
Seat angle 79.2*
Drop range with Dan’s formula 12.75-15.75

get a stem with 30+ degrees of rise and flip her over. Dimension makes one.
-Adam

I have the dimension-45degree stem like mentioned above. It is a bit heavy but gets the job done well.

Look Ergostem

http://i48.photobucket.com/albums/f201/LifeguardSteve/LookErgoSterm.jpg
.

cheapest way would be the Ritchey Pro adjustable (up to 45 degrees). A little lighter and about $100 cheaper than the Look ergostem!

You can get a 5mm Cane Creek top cap for under $20. If you haven’t already, you can mount your aero bars under your base bar, modify the risers and get smaller pads.

Viola! Problem solved.