I'm sorry about your result.
I always play Normal unless opponent is like 2 star below in defence, mid and attack or tanked/out of position.
I don't know, I just find normal mentality a lot smoother, more fluid. I would change to attack if losing or drawing when I'm statistically superior.
If I was losing with 4-1-2-1-2 narrow diamond I would sub DMC for MC switch to attacking mentality, high press, hard tackle, short, through middle, zonal, no counter, offside on red arrows on DL, DR, AMC.