Good to hear that you got off to a rather good start on them. Now is the time for tweaking! That means both your amp and the PUs height. The later is very important with BKP especially. Push them around a bit and you will notice quite the change.
With the Crawler especially this is important. Now I donīt know how you would like it to sound, but personally I backed mine up and raised the pole pieces to about 1mm from pickup to the line where the dome of the pole piece starts.
The backing up gave me less output, a more open sound, more treble and definition and more woodyness, while the pole pice raising again added more treble (which I really like on the crawler as it has the low end to keep it balanced) and gave the strings more focus and definition.
If you are someone who feels the Crawler is very saturated and rich, maybe too much so do what I did. Keep all the good stuff and let is breath more.