I am building a large 6' round dining table or my own design. After initial assembly I discovered that the top had a wiggle. When I applied a small amount of side to side pressure it would twist a bit and seem sort of wobbly. I am thinking that the legs are twisting because they are not substantial enough. here is a drawing of the leg assy. Each leg is made from 8/4 material. I was thinking maybe they should be 12/4 to stop the twisting. Do you have any other suggestions to stop the twisting?