I'm following your process. While my grandson is on a different medication, I think the process we all go through is somewhat similar. We've been highly concerned about my grandson's eating and he's a wiry boy, always has been. I do think the medications have slowed his natural growth pattern, but he isn't unduly shorter than his same age peers at this point. We just really try to push high quality calories before the medications are on board and let him eat late snacks as desired. Lately, though, he's been a bottomless pit and is quite hungry. We are hoping that this is signaling a growth spurt. He's been steadily outgrowing his clothes at what seems like a normal rate to us, so I guess the upshot of this is that body will demand food when it really needs it, but we really had to pay attention to having good, nutrient and calorie dense foods in the house and when he's hungry, we let him eat. He doesn't eat much of his lunch at school, so we make sure to have good snacks after school. So, he's not always eating his meals with the rest of us, but we've let it go. He does need to stay at the table and visit for a bit and at least try and have some milk and a "bite to be polite," but we've decided this isn't the hill we want to die on.
And another thing that we've noticed, and it may help you or not, is that it seems to be two steps forward and one step back with behaviors, focus at school etc., but we have noticed a definite steady improvement over time (medications along with maturation, he's 7). It can sure be discouraging to have things going well and then have something happen that we all thought we were done with. It starts us wondering about medication change/vacation/doctor visit, and then poof, he's back on track. It ain't easy!
He has the most amazing teacher this year and we've all learned from her. She is a balm to the soul and watching her interact with our little guy and how she takes the time to honor his reactions, feelings, upsets, and talks him through it and helps him come up with ways to solve the dilemma of the moment (frustration over having to do math and shredding up the paper and creating a distracting disturbance, is one little example) is a beautiful thing to see. I wish he could keep her as a teacher forever. But, I guess he will in a way because we all remember those special teachers and we've carried them with us.
So, onward and upward, with the occasional back slide has been our experience.