I am using yinhe and nexy as of the moment although both of them are made by xsf too. Donic balls feel really weird. I would rather use xsf than donic.
The el-s is good for both forehand and backhand. If you think mxp is too fast for you then you get the el-s with the same amount of spin but.more control.
Start with your basic strokes. It is everything about the basics. A good foundation enables you to improve faster. Also, have fun while you are practicing your strokes and playing matches.
Actually, mxs is the slowest among the evolution series. It is like a non tacky chinese rubber that is a bit bouncy. It is what i am using now as a fh rubber. It is very spinny though.