Roster Cache Question

I am having some trouble getting ahold of performance issues with my Roster cache, I have experimented with the roster cache size for weeks, moving it to 1 mb then to 2mb, trying to get the effectiveness up to a higher level, it was going to 97% and 98 % used, but effectiveness was under 30%, so I upped it to 3, 4 then 5 mb, where with Openfire 3.3.3 I was seeing about 94% used most of the time , but the effectiveness was above 80%, I upgraded to 3.4.0 beta 1 and same thing. I upgraded to 3.4.0 beta 2, and maybe it was just a coincidence, but now I am at 94.4 % used of 5mb and my effectiveness will not go above 20%… Am I missing something here? Do I need to again raise the cache to 6, 7, or even 8 MB, or is it something else? I didn’t want to cross post this to the beta area, as I don’t know if it is beta related, maybe I just don’t understand how to get ahold of the Roster cache settings to make it highly effective again…

Thanks for anyone that offers some assistance!

Scott