How to reduce the droop
When the PWM truns off I see a droop of about .6Volt.


Try driving the base via a 10 k resistor.


  That helped! Thanks a lot! – LD1117


So, did you get what you want or is there room for further improvement do you think? – Andy aka


  No, looks cool now. Thanks a lot! – LD1117


The problem is that you were over driving the base and forward biasing the normally reverse biased collector and actually raising it from close to its conventional saturation level of a few tens of mV.