Thank you. I have altered the firmware a little, nothing to do with this issue.
Believe it or not, it's not doing it any more. I was getting the little blobs, backed off the heat on the hotend and it was still hesitating, blobs not as big. Started up the next day and smooth as cream.
Noticed the 2 webcams where eating up a lot of processor time so changed them to use all 4 processors instead of 2. Seemed to help.
OK. I saw where you were going with it and I figured it had something to do with the PI. Overclocked the PI, turned off throttle control and it's running faster than it ever has. Smooth with no hesitation.