With this build you should not even need the additional disk space, since the important change with consolidating snapshots was done in Update 5. You should be able to consolidate the 4 snapshots (2 on each virtual disk) without issues. If you get a timeout error in the GUI, don't panic. This can happen if the snapshot consolidation takes longer as expected. Just let the ESXi host finish it's work.
André
PS: If you are concerned, run the snapshot consolidation after a full backup of the databases.