Congratulations! I remember the days when I thought managing even 8 ipm was doing pretty well also. Xylotex-driven machines were just unusable. Those controllers were probably the single factor that drove more people away from benchtop cnc than everything else combined.
Glad to see you are up to speed now. Your will notice your tools will last a lot longer as well. I cut at 100+ ipm on my (stepper driven) Taig as well, and even now it still looks fast to me! Its just a matter of getting decent voltage and a decent controller, whether stepper or servo.