Nae, Nae, I COMPLETELY understand your struggle...I had the exact same issue with ds2 so I know your struggle.

Before he was diagnosed with the sr we were considering a dummy anad I really wanted to hold off until 6weeks especially after having a failed bf experience with ds1 we ended up giving him the dummy at around 3 or 4weeks i think and he is still feeding like a champion almost 8month later.

Dummies can be brilliant for sr babies! and just to let you know ds was on zantac for a bit and then went onto losec at around 8weeks for a month after the month dose was up we tried him without the losec and he was fine so don't worry the sr doesn't last forever! I was told average is between 4-9 moths it will correct itself.

I think Barb has given some wonderful advice about using the dummy when you know dd is full and not to prolong feeds etc. Also I know you are worried because dummies are said to not be the best for bf but the other option is feed her and as u said that usually makes it worse or not let her suck. I wish you all the best making your decision, you are obviously doing a wonderful job xo