So the reccomended gauge for the yarn is 4 stitches per inch - and with US 8's you are getting 6 stitches per inch?
Does the pattern also call for 4 stitches per inch? Because if it does, and you follow the pattern, your item will be only 2/3rds the size it should be.
But the pattern may call for a different gauge then reccomended on the ballband.
If the pattern calls for the 4 stitches per inch and you don't like the look of the fabric AT GAUGE then you need to find another pattern, or recalculate the one you have.