@Jaime2K
Even if Some of the Aer Lingus A330 are moved away from stands during the week there will still be problems on Weekends as they operate AGP, FAO in the mornings.
don't forget that one of the EI aircraft that arrive in such as EI104 and EI136 will go AGP and the other goes to the Hangar for regular maintenance checks. They won't sit there for long periods of time so there will be space.
Also, as has been pointed out here too, EI109 and EI139 don't use the USCBP facility due to USCBP staff not working after a certain time. So I reckon the aircraft that operate those flights will be departing from Pier B. Aer Lingus have said that some of their flights will have to operate out of Pier B during the summer schedule due to capacity issues in T2 - which was also mentioned here before. To be fair it makes sense to use the closest pier to T2 to allow for the overflow don't you think?