I am a total chest man and in desperate need to find info. on what bars provide the most or best busty providers.

Try Adelitas first (hottie central) then Chicago Club.  These bars have the largest selection of chicas as well as surgically modified chicas (chicas with boob jobs, etc.)  However, the Zona isn't that large and you'll do better looking for what you want than asking advice from others.

and day or night?

really big at night....

You didn't answer real or enhanced but the best two clubs are AB and Chicago.

Chicago seems to be hit or miss more so these days. Some times, the place is rocking and there are many hot girls, other times, it's very sleep and desolate in there.

AB is always happening and starts from the afternoon whereas Chicago starts around 8-10 PM  

I'd say that AB has more really hot girls. But don't expect much of a personalty, it's all show. These girls don't have to do much since they are super hot looking.....

Renata is pretty busty.  Her pictures do not show her breast very well.  She is at least a D-cup or better.

I've seen Renata and her hoots are no where near a D. She is a small C. Even her ad says C. Not a big deal unless you're a hooter lover in which case one letter can make a huge difference.