Which statistics are you referring to? My guess is that you are talking about AVC which can report about the data usage for certain applications. AVC is since 8.1 also available for FlexConnect, so that might explain the recommendation to upgrade. Do keep in mind that this feature is only supported on 1530, 1570, 1600, 1700, 2600, 2700, 3600 and 3700 access-points.

You can use AVC to remark the Lync traffic with a certain DSCP value, but if you have your "regular" QoS configuration already in place this is not required. Just make sure that the QoS profile has been set on the SSID and that the traffic is being marked with the correct DSCP and CoS value when it reaches the FlexConnect AP. For a successful QoS implementation it is very important that there is "end to end" QoS configured (so from server to client and client to client). I assume that you use local switching because of using FlexConnect, but if you use central switching you need to trust the DSCP markings from the WLC as well.

You can find more information in this technote.

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