Firstly a trial dog which is hard mouthed is not marked down, it's disqualified...
A heavy dummy will only deplete drive as will repetitive drills with a normal dummy... both courses of action your are considering would probably make your issue worse.
Have a session with HH hands on is always better than stuff written on a forum... if you don;t get anywhere we can readdress it, but there is little point taking two different curses of action at the same time, chances are HH will address this how I would and in person is better than the written word.
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