Newbie CS6 Trying to export Quicktime h.264

I am new at exporting.   When I use the h264 format and it's maximum quality it's a 55 MB file.

When I use the customized Quicktime and then h264, my file is only maxed at 8MB.

I'm trying to figure out how to maximize the size of this :30 commercial for air.

All help is great appreciated.   Thanks in advance.