Standard cover plate??
AP clutches come as a 3 peice kit, clutch/friction plate, cover/pressure plate, and release/thrust bearing.
You can use a standard release bearing if you want but without the uprated pressure plate you've wasted your time because it will not grip any better than a stock clutch.
The reason uprated clutches feel heavier and need the pedal mod is because they have a much stonger pressure plate than a stock clutch (this is why they dont slip when you up the power).
Not that this helps your problem but i'm suprised Burtons would only sell you the clutch plate and tell you to use your stock pressure plate!!