I have been using a delta-neutral strategy for a while . It has been extremely consistent but not very profitable. My net returns are around 4% p.a. I am now quite confident borrowing to improve the economics, but care to understand the terms in full prior to doing so. I asked the IB helpdesk for detailed terms, etc....they have not shared much. I do not want to be caught off guard with a margin call. Any experience or advice regarding this matter?