We have a limpkin (screaming bird) outside our bedroom. It screams all night & is very loud. We want to replace our 8' X 8' sliding glass patio door in the bedroom. We've been investigating the STC & OITC ratings. What ratings should we strive for on a door this big? We've been checking with Anerson which has a STC of 31 (highest) & OITC of 29 (highest); Pella which has a STC of 32 & OITC unknown.