daivid,
Here’s something you wrote last year in http://discourse.textkit.com/t/what-i-did-studying-greek-today-in-greek/14099/269 that I found revealing:
“Nor could my driving instructor understand why I kept repeating the same mistake despite repeated corrections. Eventually he lost his temper which I take as a sign that I am not typical - driving instructors who shout at their pupils soon run out of customers.”
No-one here has lost their temper with you, but it seems to me that you are “not typical” either of people who try to learn to drive or of people who try to learn ancient Greek—or not of those who succeed. You are like me with physics—I get so far and no further. Let’s face it, with some people Greek just does not click. It’s possible you’re one of them. There’s no disgrace in that, only a lot of frustration. If you’re determined to persevere, I’m sure you’ll continue to find people here willing to try to help you. I’ve tried quite hard myself, as you know, but failed. But I do think you’re wrong to blame your relative lack of progress on the lack of suitable materials, and sometimes we just have to admit defeat and move on—as I’ve had to do with physics. There’s more to life.
Michael