I'll try to scratch the annals of my mind for any tips.

Regarding 1v1 on MP, most of the time, even against an experienced pro, your opponent will show a weakness during his attack, be patient, watch out for it and exploit it.

Certainly, grouping and turning I feel is very important, amongst many other things.

The thing I love about about STW MP is the fact that even playing the same opponent again and again on the same map, even with the same armies, you never have exactly the same battle. Which is why another key point and do what Luke Skywalker did and 'feel the force' and be able to react to each scenario.