You should be able to trust whoever you are working and if you dont find someone else. If I were working with a buyer I’d be trying to get them the home for at little as possible even though I get paid less. Sure there are Realtors out there that want a higher price for a larger commission…I was just never one of them. Maybe that is what led to me getting into another field. I was doing what I thought was right and getting paid less for it.
I’m sure any pre-negotiated fee with an atty only includes a certain amount of hours of work and if they find out it’s going to be more work they will charge you extra.