Ah, I remember, this was like my first post when I joined piano street...
Backwards and hands crossed is the same thing as playing regularly.
@ OP not sure it's the different weight or whether that just shows up faults that are otherwise not apparent. Do you have access to someone who can have a look at what you're doing?
Check out your chair as well.I write this because when I see all these nice videos people put on YouTube, with themselves playing keyboard at home, I sometimes shudder when I see their ergonomical arrangements. The keyboards are jumping around on fragile stands which forces you to observe stability as well as playing, and people actually sit on kitchen chairs etcetera. I have no idea how it is where you live, though, I just ask you to mind this aspect as well. As a freelance translator and an author, spending extremely much time writing on my computer, I have learned, the hard and painful way, the importance of perfect ergonomy. We tend to be a bit careless in our own homes, which of course is a disaster if you do a lot of work from home.
About 4 years ago I purchased a Yamaha DGX-640 model with "weighted" keys. Being an inexperienced pianist back then the keys really did feel weighted as opposed to my 66 note keyboard. However, now that I've had access to upright and grand pianos in school, my finger strength and sensitivity has changed drastically.Let's cut to the chase. I'm currently out of school learning the Waldstein 1st movement on my Yamaha keyboard. I find it VERY easy to obtain tendon cramps when I attempt to take the piece at a faster tempo. The keys feel like feathers: there is almost no strength required to push them down whatsoever. Even after warming up for 30m-1h, I still face this problem when trying to play faster passages that I would otherwise be able to play on a standard piano. Has anyone else faced this problem? Should I just practice everything at a slower tempo for the summer and attempt it at a faster tempo when I have access to a grand/upright? Thanks in advance!
Would it be helpful if I posted a video of me playing on the keyboard to see if any diagnosis can be made?