Theres a few issues. First of all, you're playing on hall of fame which is a complete cheesefest. If you're not playing on sim then the shooting percentages are ridiculous. Second of all, you're playing on the 76ers, one of the worst teams in the league. They dont have any reliable shooters, no guys capable of creating their own shot and no post presence. If you have a losing record with them, then you're not doing anything wrong. Thats to be expected. The GMs warn you about the whole rebuilding thing and this is why.