2 questions to Yamaha digital pianos’ owners

• ⁠I have Roland LX-5 with PHA-50 which is great but a bit too heavy for me (even at 15 touch settings). Due to some health issues my hands are not very strong and they get tired quickers. Key action of Casio Previa and Yamaha are ideal for me. I am thinking about exchanging it for MODX M8 as it has better sound and lighter keybed + a ton of extra features. I am only worried the GHS will get loose and clunky after years. I experienced this in a studio of one of the teachers on his Yamaha DGX. Did you have similar situations with GHS? I know that the alternative can be CP88 or 515/525 • ⁠I have one problem with Yamaha keyboard - when I plug my beyerdynamic headphones to the it doesn't sound nice and bright comparing to what I can hear on youtube. With Roland on the other hand there is a strong sound, although not very realistic. Is it because there is no proper headphone amplification?