Motor pulsating

[Binhill1]

Hi seem to be getting a bit of pulsating feeling in motor power if you know what I mean. Levo expert. I liken it to the feeling you get when you hit the max assist . But not as much drag as that . I thought or was hoping I was imagining it ??? . Had it today maybe at 10 mph . The latest motor has not so much drag as the previous ones i noticed when you hit max assist 15 point whatever it is mph . Curious if anyone had this issue.