"Can we control anything, programming wise, on our end to bypass anything weird that Comcast may be doing?"
Thats a rather large question. it really depends on what the "Anything", specifically, is.
If the options are still showing in the E wizard, the change to remove them must not be getting saved some how.
you can edit the code directly to remove the CC and BCC settings. open the webasssist/email/waue_<page_name>_1.php file, where <page_name> is the name of the page.
the BCC and CC code will look like this:
$WA_MailObject = WAUE_AddBCC($WA_MailObject,"email@example.com");
$WA_MailObject = WAUE_AddCC($WA_MailObject,"firstname.lastname@example.org");
remove each line to set an BCC or CC address