Hi Belli,
Beats me why people have difficulty with electric motor speed torque graphs. They make perfect sense to me. But then I've been using them for many years. The big problem I see is getting good graphs from the motor suppliers. And Kostov seems to be one of the better companies about supplying quality motor specs. They also appear to respond to inquiries. So you can put your questions directly to them.
I have discussed "how to read motor curves" a number of times on this board. It is difficult even for me to get back to some of those posts. But spend a while with the search feature and you can find some. Here are a couple of starters for you:
http://www.diyelectriccar.com/forums/showthread.php?p=149088&highlight=characteristic#post149088
http://www.diyelectriccar.com/forums/showthread.php/electric-motor-output-wrt-voltage-32492.html
Please read up on it and come back with specific examples and questions and I'll try to explain it for ya
major