Hi Annika,
Glad to hear you like this template and are using it in one of your courses! :)
I'm having a hard time understanding the first issue you're describing, but it sounds like something you may want to open a support case for. Here's a link to the form:
http://www.articulate.com/support/contact/submit.phpIf you'd like the learner to retake the battleship quiz with different questions then yes you'd have to duplicate the quiz and redirect the learn to that quiz when they click on "retry".
In terms of the score, unfortunately there is no way to say "if they get 80% on either this quiz or that quiz then they pass the course". The only way I can see to make it work would be to check all the questions (in both quizzes) in the results slide and then set the passing score so that if they pass one OR the other, they will pass. For example, if you had set the passing score to 80% for 1 quiz, you'd have to set it for 40% so that if they pass either one of the quizzes they're still receiving a passing score.
Hope that helps!