Six months and still not getting it? heheh.

When you were spanked, did you have to count and thank him?

I suggest you put yourself over his knee and ask for his assistance. He'll know what to do... even if he doesn't know your immediate goal. Then, on each stroke, count out the number and thank him, emphasizing the Sir. And of course, ask prettily for another.

One Sir. Thank you Sir. May I have another Sir?
Two Sir. Thank you Sir. May I have another Sir?
You get the idea. Don't stop asking for more until you think you've got it. Repeat daily and twice whenever you catch yourself omitting the honorific or using his given name without permission.