They are a great 1-2 punch... I have mine drilled the same and the Scandal Pearl is about 4 boards weaker overall, but is cleaner down the lane with a touch more backend... My only recommendation would be taking your Heat X-Treme to 3000 w/ FF polish to give it a little more length if possible.... You might find that the Heat & Scandal Pearl will cover about the same amount of boards, but a little difference in the backends.
Hope this helps..