with sticky source-ip you definitely do not get equal loadbalancing.
Moreover, you can do a 'sho summary' to see the distribution of flows accross your servers.
No need to log all flows.
Sticky source-ip can give you bad loadbalancing result due to megaproxy. This is something well-known.
This is why a lot of people install ssl module to decrypt https traffic and use sticky based on cookies.
Gilles.