OK - once installed do not be surprised if the air flow to each diffuser is not equal. Expect the shallowest diffuser to have the largest boil if all diffusers are the same size. If this happens you will know why. If the boils are equal consider yourself fortunate. Over time one diffuser may clog faster than the others, likely the shallowest one. This is due to more light reaching the diffuser and bacterial-algae growth will develop on the diffuser pores and gradually begin to restrict air flow. This could force more air to the deeper diffusers.
