20 points in 20 days
To answer Tempo's question in his last comment: Yes, CTS training seems to work. Not only I feel better, not only I spot more patterns in shorter time, but also my rating is increasing steadily, with a speed of one point a day. Coincidence or not, this is exactly the speed that MDLM promises with his training method. In the last 20 days (6000 problems done) my rating increased by 20 points, and in most sessions the band of variation was as narrow as 20 points or even less. The only question is: Can I maintain this for another 300 days, or will I suffer from downslips and backlashes? Time will tell.