Hugs, Marianne! It's hard when it is a struggle. I'm going to try to address at least some of the items in your post, so bear with me.
Has she always been small? Has her percentile changed significantly since birth? Are you and/or dh small? If she's sticking with whatever percentile, or even varying up or down by one, she's probably growing OK for her. It does mean that most everyone is bigger than she is, but that's not necessarily bad. (Someone has to be smallest... or biggest) If she has been dropping percentiles consistently, then there probably is cause for concern, but sounds like doc/hv are trying to address that.
Speaking of, did they ever suggest trying to feed more rather than or in addition to solids? Milk has much more calories per volume than solids, so I was surprised to read that they wanted you to use solids instead of more milk/formula.
You could try going back to more of a 3-3.5 hr EASY instead of 3.5-4 to try to get more calories in.
Please don't use how much you pump as an indicator of your supply or how much she is getting from you. It's not a good indicator. All it really tells you is how well you respond to a pump.
Most likely dd gets more from you than you pump, as they are much more efficient at getting milk from you than a pump is. And lo's really can be done in just a few minutes. When Isaac was your dd's age, he fed in ~5 min per side, tops.
I've heard of lo's taking less time than that.
I don't know what to tell you about the bottle quantity at bedtime and df. Could be that if she took a full feed at 5 then she's not really hungry at 7. At 10:30 she may be too sleepy to eat. Like I said, I don't know. Just trying to throw out some ideas.
Do you pump between 5 and that first nw? When is that first nw? I'm thinking that may be a long time to go without some sort of stimulation for your breasts.
You say she pulls off before the flow slows... Do you have overactive letdown? That sort of sounds like what you're describing. If so, she may be trying to "drink from a fire hose" and can't get settled. Will she settle after the flow stops?
Is she spirited? I know it's awfully difficult to get a lo to sit still for a bf at this age, no matter their temperment, but especially so for spirited ones. Are you feeding in a quiet dark place? If not, that may help cut out any distractions.
And yes, teeth can have something to do with it. Have you tried giving her Tylenol or baby orajel for her gums? Sometimes doing that 15-30 minutes beforehand can knock out enough of the discomfort so they can latch better.
Hugs again. I'm afraid I have more questions than answers for you at the moment.