Max, I resisted playing scales for the longest time. I now have a new teacher and he told me the first thing I needed to do was work on technique, at first I thought he meant volume, phrasing etc. It turned out that I need to strengthen my hands and program them to be able to instantly find the necessary keys.
I am currently working on Hanon's exercises and I have to say that even after just one week of practising these exercises I can feel my fingers, especially the weak 4th and 5th fingers, getting stronger. These exercises work both hands, thus strengthening equally.
Here is a link to the exercises:
http://www.sheetmusicarchive.net/single_listing.cfm?
composer_id=7
Enjoy the Journey!