Hey!
Sorry to hear your stuggling with hay consumption and im very sorry for the loss of your other bunny.
Lack of hay consumption can be a problem noticed by a lot of bunny owner its seems.
One if my buns never consumed enough hay but now eats it in heaps! The main thing that worked for us was reducing pellets. I dont know your buns situation but a cup of pellets a day seems considerably more than necessary. Usually an adult rabbit should have approximately a tablespoon/ one egg cup/quarter cup of pellets a day, sometimes less.
My bunny gets just 8 science selective pellets a day because hes had a history of spurs and my other bun gets 12-15 as she needs to put on weight. They also get a pinch of a grain free forage mix that includes pellets, probably a teaspoon of that daily.
Rabbit will often choose to fill up on the tasty things first causing them to eat less hay. If you do plan to reduce pellets to see if it helps its worth noting that it should be done gradually 🙂