Try this:
1. Bottom out the dwell
2. Set your input pressure to about 120 psi
3. Increase the dwell until the marker cycles properly at +/- 10 fps consistency
4. Increase your input pressure up to desired fps
5. Increase the dwell up by 1 until velocity stays consistent. If consistency is already good. reduce the dwell down by 1 until it becomes inconsistent, then bring back up 2.
Should be around 20 blinks +/- for the Smart Parts QEV