Chet,
I also don't believe that rule 8 applies in these situations. IMHO it covers the miscalling of hands whether deliberate or not.
In the case of an inexperienced player I would take that into account in certain situations, for example, in deciding whether to apply a penalty or how severe a penalty would be; however, in what I see as clear breaches of the rules, I would not tend to take inexperience into consideration.
First, it encourages endless debates of the, 'You allowed it for XYZ' last month' type and I really don't possess the judgement of Solomon needed to assess what constitutes inexperience: is it the playing of one tournament or ten? The second reason is that it confuses players and I believe the clearer and firmer the rules: the better the game.
That is not to say that I don't have a degree of sympathy with inexperienced players but we don't allow them to break the rules (knowingly or unknowingly) in soccer, tennis, football et al.
Best,