Sorry for the double post but I just remembered something while I was in the bathroom

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Managers in lower leagues tend to play simple tactics etc. Top managers are more likely to vary their game according to what you throw at them. Conference managers simply play to their strengths.
For instance, Kidderminster have one tall and one fast striker. They will play in a way that the tall striker plays opposite your smaller DC, and the fast will play against the slower DC. This means they will change positions every time you match them. You need to be always paying attention to physical mismatches like this.
At Conference level players are not that skillful so a physical mismatch can make a huge difference. Also try to create mismatches to your advantage when you can. This can help you tremendously when you play equally good or even better teams.