Perfectly normal, the fingers have different ratios of power and speed. That is why exercise develops them and practice internalises the movement. As said the brain has to work out what is required and sevice the movement.
Each hand has two very different and distinct muscle groups and nerves, the brain contols them both, so you have to have them working together. If you cannot co-ordinate the movement then when you practice you are actualy practicing is unco-ordinated movement. You are making the unco-ordination dominante, you are indeed ingraining the action not to work, not get better.
I have written many times on the functions of playing from a body mechanics point of view. The bass, or any instrument, is the brain defining the movement to you. Muscles do not define the movement the brain does ( unless it is reflex, then the brain is by passed). Exercise, train, develop, or what ever you want to call it, the hands so they can function to play. Practice is play, the two tasks are seperated by what the brain calls them, the hands move the same as in practice as they do in playing.
In playing or practice the hard work of physical development is at the start of the task. If the task goes on to long then the benefit becomes negative. For the players that practice hours and hours a day, they can know off a couple of hours and it will not effect the end result of what the do. In fact long practice session or playing at some point starts to become wear and tear, in other words damage.
A player has a mind set that will have them believe that hours of practising will pay in the end. The reality is that for some it will for most it results in damage, and damage that shows up later rather than sooner.
Jazz Ad has it in a nut shell when he says
There is another one similar to have in any physical movement which is "fast hands, slow head". Giving yourself time to think is a big plus in any walk of life.
It has been said so many times i will say it again,
practice slow Since speed is a different task to playing, you learn and work on the playing movements slow, then all you do is speed them up. It is that simple, but remember it will not work for all. With all the training, exercise, practise and time in the world it is not guaranteed you will get what you want.
Look to any sport and all you see is the top flight, you do not see the many that done the exact same but got nowhere. This is reflected in life as well...there are no gaurantees, but a player needs belief and that is what all this is about, the belief that it will work...its reality may be a lot different.
)... Wiggle your index and middle finger back and forth as fast as you can (making sure your fingers and hand are relaxed). Now do the same with your fretting hand. I'm gonna bet a million $$$ that you can move both hands at exactly the same speed - no matter how long you've played the bass.
Just messin, check out this dude:
