Implementing Window Azure Cloud Services Web Role With Shared Cache Dedicated Roles?

Implementing Window Azure Cloud Services Web Role With Shared Cache
Dedicated Roles?

We(our company) is hosting a asp.net C# Cloud Services with a Web Role for
a Reporting WebSites. Unfortunately, usage of the reporting Website is
growth that original is only hosting with Medium Size VM and find out its
having a memory leak that cause the Cloud Services is always down and stop
working. End up we move to A7 VM(Okay, thats expensive) that solved our
problem for 2-3 month.Somehow, new stuff develop new function develop that
end up the memory is more than enough(its 56GB RAM) but the process is not
really can fulfilled such expensive usage in the same time.
Looking for solution on the web and found out there was a shared cache
that can be used. We decided to move from A7 to XM VM (A7 not supported
shared cache) and with a Dedicated Roles For Shared cahce.
What we wish to achieve is load balance between few instances(if one down,
it will redirect to another instances) and having the dedicated roles
stored all of our session stuff.Am i going the correct direction for this?
And if yes, how to achieve this? I look into this and is that really need
to sign up a preview program for cache services for using this?
Appreciate for the advice and please point out my mistake if any.