"Last time I upped my gel to 3 pumps I had bleeding, sore breasts etc and reduced back to 2.. but this time increasing nothing at all...could this also be a sign of low eastrogen?, or opposite?."
Maria, this sounds exactly like me. When I first went on HRT I got every high estrogen symptom that existed every time I increased. When increasing recently I felt absolutely nothing at each increase. It turned out that originally my own ovaries were contributing massive amounts (unpredictably) and they seem to have stopped now, leaving me with too low estrogen.
So I reckon if you are feeling nothing at all now, you need more estrogen. The sore boobs and bleeding last time was probably your own body contributing a lot...