I'm interested whether or not you consider the sentences 12 and 13 bad language.
Whether or not means “regardless of whether”
(11) I will complain whether or not the committee accepts my application. ( = no matter what the committee does, I will complain.)
In all other cases “or not” is superfluous.
(12) We’ve been wondering whether or not to apply for this grant. [bad language]
(13) Let me know whether or not the printer still jams. [bad language]