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While new SDN control planes promise to provide faster and more dynamic provisioning of optical paths, mis-estimation of optical signal to noise ratio (OSNR) is still an issue that reduces the amount of capacity available in practice to allocate data paths. Typically, additional margins are applied to the estimation of OSNR for given paths, however, in the absence of detailed knowledge on the gain function of EDFAs, these margins are applied equally to all paths, leading to network under-utilisation. In this paper we show this effect over a simulated optical network based on the Telefonica Spanish national topology, emphasising the reduction in capacity due to the incomplete knowledge the network controller has on the exact wavelength and time based variation of EDFA amplifiers gain. We consider this to be of high relevance, as it opens up the road for further experimentation on the use of sparse optical …