Tomatoes in north bed doing poorly; tomatoes in central bed doing great

The central bed has 3 Big Beef Plus (new this year) and 2 Beefsteak (from my old tinfoil pack).  These all are doing great:  Lots of green; big thick stems; good number of flowers and several fruit have set and are growing.

In contrast, the north bed has ~5 or 6 including 1 Scotia and 1 Jasper -- and these are all looking kind of barren -- definitely fewer leaves, thinner stems, many fewer flowers / fruit.  I wonder if it's to do with how these are sort of "end caps" of the potato rows, and water may not be reaching them, etc.  

Oh the one Jasper plant is definitely the best of the north bed, BUT it's really long and scragly, not many fruit on the way.  Will see how it does.