Jumping serpentine belt

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Belt keeps jumping off my race car, unfortunately during the past 2 races.
New tensioner has been put on. All pulleys appear to be lined up properly. Car runs great for several sessions then, it will suddenly come off with no notice. Any suggestions? Thanks in advance

 

[99 R/T 10]

Can you use a smaller belt(1/2")? A tighter belt won't jump as much. Just thinking out loud.

 

[1TONY1]

Never ever heard of that on a Viper. Is your power steering pulley stock ? Power steering pump bracket ? Also check the balancer bolt for tight/torqued. That would be where I started.

 

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Yes, the PS bracket and pulley are stock. I will be replace with new pump (just to be sure) and upgrade the pulley and bracket from Dave's Big Brakes. Thanks for the responses. Keep em coming.