The slew rates listed in the SLT manual are incorrect - the scope actually moves at a slower maximum rate than indicated in the manual. Here are the correct rates:
Rate 9: 2.75 deg/sec Rate 8: 1.75 deg/sec Rate 7: 1 deg/sec Rate 6: 64x sidereal Rate 5: 16x sidereal Rate 4: 8x sidereal Rate 3: 4x sidereal Rate 2: sidereal Rate 1: 0.5x sidereal