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It's been years since I've worked with a dialer interface, so I'm unsure where QoS should be applied. However, if you're working with bandwidth less that port bandwidth, you should shape for it, otherwise your QoS will only "engage" when the port, itself, congests. Also, normally you work to provide egress QoS on both sides.
If you can manage both sides egress, especially with shaping, there's often rarely need to "police" traffic, as you're doing in your class-default.
