Frank,
You will probably get a variety of opinions. Poke around the site for people growing similar to you.
Are your containers Earthtainer style or drain holes in the bottom?
Raybo's latest Earthtainer Guide - discusses some fertilizing
http://www.tomatoville.com/showthread.php?t=22584
If you haven't seen these threads, they are all good.
Raybo did a test on Ca - worth a read.
http://www.tomatoville.com/showthread.php?t=19973
He did a related one on Epsom salt (Mg) as the relationship between Ca and Mg are intertwined.
http://www.tomatoville.com/showthread.php?t=19955
Calcium Nitrate and BER
http://www.tomatoville.com/showthread.php?t=14513