Not to sound like a smart ass, but somebody did all that motor work to your bike and didn't offer to upgrade your clutch?? WTF? Here's a couple options, but I have no personal experience with either. They claim the auto-clutch has 20% more clamping power and the manual unit has 56% more than stock ... sounds like the 2nd one would stand up to more power and abuse.
http://www.rekluse.com/images/exp_hd_product.pngJust Shift, Twist, and Go
Free your clutch hand with the Rekluse automatic clutch for your Big Twin Harley-Davidson®. Come to a complete stop in gear and accelerate without touching the clutch lever. The manual action of the clutch lever is still fully functional at any time, if desired, for shifting and taking off.
Improves Low Speed Maneuverability
There's no need to constantly use the clutch lever in the stop-and-go traffic to prevent stalls. Especially beneficial for heavy traffic situations and crowded bike rallies.
Smoother Engagement
Take off on loose surfaces with more confidence and excellent traction control.
Extends Clutch Pack Life
An Auto-Clutch will dramatically increase the life of your clutch pack, making for less frequent replacements.
http://www.rekluse.com/images/torq_drive_product2.pngDesigned For High Horsepower Motors
The Rekluse TorqDrive™ Manual Clutch is engineered to meet the demands of your high performance motor. Where other clutches slip, TorqDrive™ grabs the asphalt, doesn't fade, and puts the power to the pavement.
Clutch Lever Feel Is Uncompromised
The Rekluse TorqDrive™ Manual Clutch will not make your lever feel heavier than stock. In most cases it becomes lighter.
Feel The Torque
Our rEvolutionary clutch pack configuration allows you to feel more torque at the rear wheel. Up to 56% more!
Thin Friction Technology
Rekluse Thin Friction Technology provides performance benefits that you can actually feel! Through innovative engineering and rEvolutionary thinking Rekluse has developed a clutch pack that takes a traditional 18 plate configuration to 31 plates. This increase provides more torque at the rear wheel which is especially effective for highly tuned motors.
Someone mentioned this auto-clutch in the hayden thread in here and after checking it out it looks pretty slick to me, but also pricey at $800. The only downfalls I see with a centrifugal clutch is no bump starting or parking in gear to hold on a hill ... not that either are that big of a deal if you really think about it.