[Dark_Swan]

I have felt tingly sensation sometimes, but it is the same sensation when I get muscle contractures on my shoulders and back.
Not always, just sometimes. So I don't know if it is due to my tendency to be nervous all the time or related to pumping. I don't know.

However I must say dome position is too very important. TRY not to catch your armpit zone, most of the nerves for arm movements are around there!

Yeah I was wondering that too, it might have something to do with the armpit region as well. My breast shape is such that the domes naturally end up pressing against the armpit region. My boobs are kind of set wide apart and face outwards.

I might have to hold the dome so it stays away from the armpit.