Herbert, You and I seem to have a different problem, and as you know I started by just reading the music in McFarlane's Scots Lute. I am about to take my second lesson (the first was a couple of months ago, and I was instructed to stay away from songs and just practice (p,i) with thumb under type runs. I tried, but I'm incorrigeable. I find my right hand ring finger (a) to be my strongest, it always wants to play - and my little finger is quite happy to stay on the soundboard. Perhaps it is my folk guitar "pickin" experience, rather than the classical many of you have. But then again it may be the difference in hand shape we each have, or the other things we've done with our hands.
Best, Jon