Where to aim your hands when driving?

I have always been curious about this. Some people say you should aim 4 inches ahead like on irons and some say you want to hit it on the upswing.

Im asking this because my driver is VERY inconsistent. It seems like everyday im changing up my grip in order to hit it straight

If you play the ball on your left heel, you will hit the ball on an upswing (yes hit the ball on the upswing).  As far as aiming goes...I aim for the ball; perhaps I'm misunderstanding you.

Good question though!

don't worry about hitting the ball, that's what the club is for. just make a swing with your momentum going towards your target.

I found putting the ball more towards the middle of my stance helps me out...  I use to put the ball just inside my left foot but found I sliced the ball more, once I put the ball more toward the middle it has really helped.

I tee it up at center as well...My setup (and ball flight) is now much more consistent. I previously had 10-15 yard fade/slice. I now have a straight/5 yard fade.

I do however have a lower trajectory now.

This is going to sound completely contrary to what you are hearing on every other post I'm sure.  If you are having side-spin problems with the driver, you'd be better off hitting it level or slightly descending (0* approach angle to around -2*, but anything else is too much backspin).  It will add a little bit of backspin which will tend to counteract side-spin.  You could also try a stiffer shaft which will tighten up the dispersion and reduce side-spin.  As far as ball position, place yourself at impact.  Tee the ball up so it hits right above the center of the face.  Then make a swing to get back to that position.

If you are going to ignore this advice, drop your right shoulder at address and play the ball inside your left heel.  That will get the club swinging up.