hi dave,
Having read all these threads I don't see anything wrong with what you did I further see nothing wrong with you as a 'warning' giving a missed hand 'penalty', I am of that train of thought now and give less warnings and more missed hand penalties as it seems to get the message across, I also like that you have adopted in your rules, that even where a warning would suffice, a penalty shall be issued, nothing wrong with that and don't doubt yourself.
Making the 4.75 stand seems fine, Your explanation of button movement is correct also. Everything you did seems fine, it is just a case of the wording on the original post which seems to have caused a little confusion between a penalty and a warning, so I wouldn't worry at all.
Best Regards
Stuart