If making adjustments and accuracy are your biggest areas you need to improve upon, you need to develop practice sessions around these two areas of your game. The advantage to doing this alone would be you know what you need to work on and can place 100% focus on this, however the advantage to practicing with one or two others would be the ability to simulate league/tournament pressure situations easier than if you were to do all the bowling alone.

For accuracy I have spend practice sessions where I play one game focusing on hitting straight up first arrow, then another game straight up second arrow, the third game straight up third arrow, another game swinging from 5th arrow to 3rd arrow, a following game throwing on an angle from the gutter as in a frozen rope to the pocket. I don't focus on the score- I give myself a point if I hit my target or a zero if I don't and I factor so many points out of 10 for that game. As far as making adjustments you just have to pay more attention to when you see strike balls hitting light or high and then making the correct moves with your feet and eyes to correct the problem. I'm guessing going onto Ron Clifton's http://www.bowl4fun.com site would be a good start for some practice drills.

Let us know how the progress goes.

Matt