g day ,
i dont think your s/c will handle 2 of those 280 ?? motors , what sized props ??
the problem is the smaller motors can draw more power than 10 A s/c can handle -some small motors draw more Amps than a low draw 555 , due to poor construction .
i would fit a 25 A mtroniks s/c , to give a large margin of safety , this would allow fitting of 1 s/c to 2 motors +safety margin .
also i would try a buggy pack battery ,say 7.2V, as this should fit into the small hull
you really need to hook up a Amps gauge , and find out what Amps your 2 motors are drawing , its not that hard, but you do need a gauge or multimeter .
its very hard to advise , due to the big variation in current draws in motors , 2 motors who look the same , can draw completely different current amounts
good luck bill s