I managed to get the aisle in the middle from Toronto to Taipei. But unable to get the front cabin of the 2-4-2 from Taipei to Manila for my March flight. But managed to get the return in April from the front cabin from Manila to Taipei.
I think its a bit unfair that when we pay premium economy all the way then they do not give those seats of 2-4-2 to the long haul passengers.