I don't have any experience with the XTi. Although, I have found that each model of Malibu reacts differently then the other. For example, I have a friend with a 24 LSV and we use the Wedge 1/2 down for surfing, which doesn't work well on my 23. I can't speak for your XTi, although, IMO at such a slow speed, 9.5mph, the Wedge all the way down doesn't change the wake that much on a 23LSV. The Wedge 1/2 down creates way too much drag, and we have to apply too much throttle to keep the boat going. It just feels like it's straining everything too much, but this is just my opinion.
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