That was my thought exactly!you aren't edge joining...you are END joining. Gluing ends doesn't work that great biscuits will help.
As a suggestion and it will make life a lot easier. Use lap joints and no biscuits / dominos / dowels. An inch "lap" glued and clamped would be as strong as the wood itself.
You could put a slight chamfer (1/16 to 3/32) all the way around the boards of the table top. You may have to do one end of the lap joint with a sanding block.
The result is that the table top will look like tongue and grove. For a casual dining table that would be very acceptable.