looks good!
do you have a
ball valve on each eductor outlet? if you really want to see how well an eductor works try turning all of them off but one. that sand will go everywhere! just one eductor running properly will move more water than all 4 that you have. you may actually be getting less flow using the eductors than if you were to just have open pipes. if you were to use the open pipes your sump would prolly drain in secounds. using one eductorth will also lower the total amount of flow through your sump. helping your overflow problem. it is very difficult to get that much flow out of an overflow. this is why most use CLS's for any flow rates above 600gph.
one eductor on my 800gph Velocity T3 was moving detritus on the opposite end of my 6' 125g!
G~