I guess being a technical guy I might propose an alternative approach. How about breaking your riding down into the various elements - bermed corners, squared corners, jumps, whoops, etc. Then spend some time just perfectly executing bermed turns. Next, switch to the whoops. Just pushing harder while riding laps is one thing, but execution of each element of the lap may help too? It is also hard to concentrate on all the different obstacles on the track during the learning phase, at least for me.
Later you can put it all together to turn some hot laps.
This may be a wierd analogy, but when I bowled I would shoot all 10 pins for a game, making sure I covered the 6-10 area, then all 7 pins, making sure I covered the 4-7 area, so that during a game I was confident when I had to carry the common spares.
Last week while woods riding I was concentrating on making bermed turns where possible on the trails. I was following a really fast A rider, and it was amazing how many berms are out in the woods if you look for them. I was squaring to the inside line in many of the turns by default, but later concentrated on seeing and riding the natural berms.
FWIW, TexKDX.