1. you can skip the S+V labelling if you don't have a problem understanding the sentence. Do it only for the sentences that you didn't understand the first time you read it.
2. Mind mapping accurately is probably the most important when you do your review HW (fo reading)
3. when you do the real thing, you obviously need to annotate and writing on the side is optional.
See what works out better for you. it really depends on your style
4. uh~~~~~ Can't help you with the last problem you mentioned. sry~