oclhashcat - ntlmv2 - question

I am trying to use oclhashcat on a ntlmv2 hash.

I have tried rockyou & crackstation wordlists and no result.

I am looking at using brute force mode. I need some help on using masks.

The password is >= 8 char with upper, lower-case, numbers and special char.

Is this mask correct:

-1 ?l?u?d?s ?1?1?1?1?1?1?1?1

If I chose a shorter mask, e.g. a 6/7-char mask, will a partial clear-text be retrieved? Or is it so if the password is 8-char, I must give a 8-char mask?

Are there any rules that I can use for such brute force?

1) yes
2 will a partial clear-text be retrieved) no
2 must give a 8-char mask) yes
3) no, that makes no sense anyway