clarify a few things

1)
what is the +/-
i mean is it VS? or +/-30 on top of the 150?

2)
not sure how do i know when to V this

thanks for the help.

1) Yes so it can be 180 or 120 in this case
2) Usually projects keep in mind where they submitted before and will not try again once it failed. When you check this option, it will always try to submit (but not create duplicates).

thank you for the help.