I am currently feeding my dog Fromm Large Breed Dog food and we have been very happy with it. I will add some pumpkin, frozen green beens or a raw egg to it from time to time. The stools are good and she seems very fit and has plenty of energy.
Or conversely, if the above is true, why not stay the course? Fromm is one of the higher rated kibbles so if you don't feel comfy with the switch, carry on.