The service charge issue has always bothered everyone I know who willingly gives tips of 15 - 20% for service. (americans do this - the europeans do not from what I'm told.) But WHAT are they thinking when they add this to a carry out??? That is a total rip off. And guess you already know the service folks want their tips in cash to pocket for themselves. So please don't put any tip on your cc, b/c they are required to split this with the whole staff.
Sad story and just another way for tourists to ante up every which way!