Things like packet loss and latency fluctuation/jitter can still cause undesirable results even with a low average latency.
Are you sharing the connection with anyone else? things like torrent clients for instance even when idle the high connection cycling can have quite an impact on gaming potentially flooding out game packets.
Also is it a wired or wireless connection and landline/cable or 3/4G?
This, packet loss may only be brief and you may not see your ping change as many in game ping stats tend to show average ping or even in real time (1 second update) you wont see packet loss normally, so it looks like your ping is nice and low but brief packet loss can look horrendous in game looks like stuttering like you mentioned.Things like packet loss and latency fluctuation/jitter can still cause undesirable results even with a low average latency.
Are you sharing the connection with anyone else? things like torrent clients for instance even when idle the high connection cycling can have quite an impact on gaming potentially flooding out game packets.
Also is it a wired or wireless connection and landline/cable or 3/4G?