I'd say that since the arrows are grouping, you've found an acceptable shaft size for your bow. If the shafts were not correct, you'd most likely have gotten arrows flying all over the place. At this point, you should be able to perform some paper tests to fix the impact point and kick to the right.

For the low impact, you can adjust the vertical alignment of your nocking point. For the kick to the right, you would adjust the horizontal of the rest. The draw weight of the bow can used to make fine adjustments to the fishtailing as well.

-Mike