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As CBWFQ classes generally can use unused bandwidths from other classes, class bandwidth allocations are really only important when multiple classes are competing for limited bandwidth and you want to provide some classes of traffic more of the constrained bandwidth than other classes.
Whether an insufficient allocation for control traffic will be damaging, depends on the service requirements of that particular control traffic.
Generally as control traffic doesn't use much bandwidth, but might be adversely impacted by insufficient bandwidth, it's "safer" to over allocate for it, which guarantees it bandwidth when it needs it, yet other traffic can use the bandwidth allocated to its class when it's not using it.
In other words, will there be real benefit to change max reserve? (Often there's not.)
