For advantages and disadvantages of certain designs, see here:
http://clubtgc.org/forum/viewtopic.php?t=8960
Did you follow the correct break in procedure? It sounds like your bads and/or rotors may not have broken in properly or are glazed over. That is my guess. You can fix this by, I think, roughing up the surfaces on both the pads and rotors and then breaking them in properly.
-Mohammad
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