Ascension, the part near the end with the corridor going up is ALWAYS a chokepoint and attackers are at a big disadvantage, even more when the teams are unbalanced

. The map was removed because of that. Maybe with some tweaking it could be added back, even to the regular assault map list.
Cruciatus also has that part with the stairs that is very painful but I guess it could be tried again.
Dunno Battlerooms.