Autoscaling Application Block not Increasing/Decreasing Instances

I have implemented autoscaling using the Enterpise Library Autoscaling Block, pretty much as described in the tutorial.

So the first time when I am running load test for my site it's increasing the instance count by one.

And when I am running load again then CPU usage is 100% but it's not increasing the instance count. And when CPU usage is 0% it's not decreasing the instance count.

So what is wrong here?

I have following Rules and Service XML. Rules XML:

<?xml version="1.0" encoding="utf-8" ?>
<rules xmlns="">
    <rule name="default" enabled="true" rank="1"
        description="The default constraint rule">
        <range min="2" max="5" target="ServiceWebRole"/>
     <rule name="ScaleUpOnHighUtilization" rank="10"
         description="Scale up the web role" enabled="true">
           <greaterOrEqual operand="WebRoleA_CPU_Avg_5m" than="60"/>
         <scale target="ServiceWebRole" by="1"/>
     <rule name="ScaleDownOnLowUtilization" rank="11"
         description="Scale up the web role" enabled="true">
           <less operand="WebRoleA_CPU_Avg_5m" than="40"/>
         <scale target="ServiceWebRole" by="-1"/>
     <performanceCounter alias="WebRoleA_CPU_Avg_5m"
        performanceCounterName="\Processor(_Total)\% Processor Time"
        source="ServiceWebRole" timespan="00:05:00" aggregate="Average"/>

Service XML:

<?xml version="1.0" encoding="utf-8" ?>
    <subscription name="My subscription name"
        certificateThumbprint="My subscription certificateThumbprint"
        subscriptionId="My subscriptionId"
        certificateStoreLocation="LocalMachine" certificateStoreName="My">
        <service dnsPrefix="productionservice" slot="Production" scalingMode="Scale">
            <role alias="ServiceWebRole" roleName="ServiceWebRole"
         <storageAccount alias="targetstorage"


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