Fluttering is good. How do you mean flat? Nipple should be the same shape it went in, a bit longer perhaps straight after the feed but the shape shouldn't change.
Kayz dd's is so obvious it is crazy. Ds1 has a slight one but his feeding was perfect. I've not had a proper look at ds2 for a while, too many teeth! He has a nice lip tie though and I reckon a posterior TT. His feeding has always been fine but needs frequent fine tuning otherwise I get sore. He can't turn his lips back right (though he improved after slicing his lip tie falling over one day!) His flutters are not the right sort basically
. In an untied tongue it undulates in nice little feathery waves, a ties tongue is sort of more.....clunky......I don't know how to describe it. You can feel the difference on boobs, or if the baby isn't your own you can feel the difference when giving them a finger to suck.
I have a TT so I guess my children were doomed.
There is only one clinic covering the whole of the North East, it is really stupid, people just quit feeding because they are in agony or having to top up their baby because they can't feed well enough before their referrals have the chance to go through.