Exch 2010 deployment guide conflict

I am trying to get up to the v3.5 guide, we set up 2010 using 1.7 or so and haven't updated since. Now, I see that it's recomending 6k users per snat ip in the pool, which is ok, I use 14 ip's in the snat pool (lot's of users). Now, it also says to use the irule (pg 24) so the user connections all appear to source the same ip (each user can have 2 to 15 connections) because outlook can get confused, but the comments aren't clear as to whether to use the SAME snat ip's or another set of ip's in the same subnet in the rule. I worry since the f5 will allocate by snat ip by default, will there be a conflict with different ip's in the irule? I have plenty of ip's, I just need to narrow down which ip's to use in the irule.