Subtracting hours in a work schedule

I have been working on my worksheet to no avail. But, I will keep trying to find my answers, trying different approaches.
I have now run into another problem with my schedule:
In row 4 all of my times are adding up correctly (except I would like to subtract 30 minutes for lunch times daily).
However, as you can see, in row 8, if an employee works different hours, as in row 8 column G with 2:15-9:15 it does not compute correctly. Even my formula for for 9G is not totally correctly.
I am hoping for some help.
I have changed the title a few times, hoping that it meets this forums guidelines. If I am not meeting the guidelines please let me know.
Thank you for any help.