I also have the Inzer lever belt. When benching with an open back shirt with velcro, I don't wear it, I use the velcro straps to hold the shirt down, but when going strapless, I will wear the belt without cinching it.
Like Jay (but with slightly smaller weights) I only wear a belt to hold my shirt in place. I don't have a great big arch, so the belt does not get in the way, but I honestly don't know what a belt is good for in the bench except for holding your shirt down after you have pulled it low.
PowerlifterJay is the kind of guy that Rocket was referring to in his post above.
B