First, Shamus is fine eating only Romaine daily, so don’t worry about that. I a couple of months/years (not kidding) he may want to try some other greens. But romaine is a staple in my house and I really don’t diverge from that or green leaf as Sammy’s basic. I add kale (she loves it), or carrot tops, or curly parsley as a second type of green. She likes a little variety, but is fine after that.
The hay problem is common, and after devouring some fresh hay last night for over an hour, she left a pile in the hay bin that looks like she didn’t touch the stuff there’s so much left. What seems to happen is they like it fresh, they pick through it, then it’s ‘old’ in their eyes and they ignore it. I have had this happen whether it’s a full amount or a more limited serving that never gets finished. So I would first suggest you give less and let it get mostly eaten, then freshen it up more often.
Also, turn it over in the container they eat out of and fluff it. Sometimes what’s underneath gets flattened, but is still tasty so toss it after a day and see if they eat more again.
Definitely might prefer a different type of hay. My girl ignored Timothy but devours Oat Hay. It seems dry, but it has tasty bits that she can’t get enough of. She forages through it happily. Regular or Mature Oat are both dry looking but she loves it.
Other bunnies prefer a very soft hay, so Orchard Grass or Second Cut Timothy are good choices. I think Broam is a blend, so some like that. The thing to do is try the smallest amount you can purchase and experiment. Some bunnies even change their minds after a while, so you can keep what you buy for months and switch it out if they begin to ignore it again. Don’t forget to try separate holders for different hays. They may not like eating what the other one has already tasted. All hay is healthy for them, so you can change kinds without worry.