Replacing a DNS Server with F5 BIG-IP DNS

We really would like F5 to be an all in one DNS solution, unless you have a really good reason why it should not be. We won't have 1000s of people doing recursive DNS but we need to do it. So CAN DNS Express do recursion, with cache to the on box BIND, if yes how? I have followed your steps, but if I disable "use BIND Server on BIG-IP" recursion no longer works.

I have successfully configured DNS Express to respond to authoritative zones using the on box BIND by follow the steps in your original post. I can disable "use BIND Server on BIG-IP" and this works. just not sure about recursion. Thank you so much for all your time on this, it's been a little difficult finding someone to help with architecture, mainly because these are so many options.