Okay... not wanting to come across as critivcal... but does this have to be tables?
You have 3 content zones... and not more than 1 item per row?
That would be 3 divs... thats it!
Maybe 1 outer wrapper if you like... 4 divs... thats 8 lines (open/close) - compared to the Tables 14?
Still, ignoring that... what styling have you tried to apply to the table?
Have you tried...
<table style="width: 600px; margin: 0 auto;">
???
Or applied an outer div and done it to that (along with text-align: center;) ???
Give those a try.