It is not unusual, if you are right handed, to feel like your left hand is just not as skilled at playing. Weakness and odd positions are both, in my experience, caused by there being tension somewhere. It doesn't have to be a lot of tension, it can be rather subtle and still be enough. For example, if any of my fingers, including the thumb, are slightly tense, all my fingers feel weaker because the tension makes them more difficult to move, even if you still can move them just fine. The tension steals some of their agility and power.I could probably help you out quite quickly in person but it can be hard to diagnose and offer good solutions over text, because there is a lot of room for misunderstanding in both cirections of the communication. So yes, the problem can be improved/solved. You might need to figure out what you are doing that is causing the tension/miscoordination first though.
Thanks for the answer! I have been analysing my playing and I have found that indeed my left hand has been suffering from some tension (especially in scales or high finger work). It's mainly in the wrist and I guess somewhat evenly distributed between the fingers and thumb. Also I noticed that my left shoulder is ever so slightly more tense than my right, so I've seen to that rather quickly. At this point though my question is: Is it possible to get rid of this ingrained tension? Also I've attached an image of my hands in a resting position as to prevent any misunderstandings, as you've said before.
Vincent Persichetti wrote a great book or exercises to help develop the hands equally. They are quite "modern" but very varied and cover the most useful aspects of piano technique. What's good about these is that they are all "mirror exercises". What one hand does, the other hand does the mirror opposite. So you just need to try to have your weaker hand mimic the stronger one. I'd recommend a lot of very slow, deliberate practise like this.Definitely not for beginners though. here's the linkhttps://www.sheetmusicplus.com/title/reflective-keyboard-studies-for-piano-sheet-music/1821938
I used the vendor's "look inside" feature.How is this different than just using contrary motion while doing scales or whatever?According to your link, it looks like it's very much for beginners, at least as much as any scale syllabary or set of patterns.
Here's a few from later in the book. They are different from contrary motion scales or whatever in that the hands are mirroring each other exactly.