Based only on what you say at the end, it sounds like you believe in an entirely fated world and choice itself is an illusion. The only reason astrologers haven't been able to pin down what people are doing from moment to moment is because they either don't have the astrological ability or don't have the time to work out the necessary equations.
If EVERYTHING is entirely predetermined then I go back to my previous statement of saying that, with this view of the world, there is no reason to try to do anything. Everything will happen as it's going to happen and you might as well just sit back and let it happen.
As mentioned, this theory that everything is predetermined simply leads to stagnation since there is no reason to try if everything will happen as its meant to be. Following out the logic there is no reason to get out of bed or do anything because "whatever will be will be" and fate will simply force the person to do what is required when it is needed.
However, based on what you said earlier, I think you get at what I was saying. A person is fated to have the chart energies they have. What they DO with those energies is the person free will. Naturally, if they are UNAWARE of those energies, those energies will tend to automatically follow the path of least resistance: stressful aspects will lead to stressful situations, easy aspects will lead to easy situations and they will tend to follow a "fated" path in life. However, if the person knows their astrological chart, they can DECIDE (i.e., use free will) on HOW they want to use their energies. They are still fated to have the energies they have, and so their choices will be limited to using those energies, but they can use those energies in the way that is best for them.
We have the same idea of the chart being fate, where we differ is you say that the chart pattern determines the fate of the person's life (traditional astrology) while I say that the chart pattern determines the different energies a person has to work with in their life (modern astrology).
About the differences,
Tim