I like it overall. Only thing I think can be to good is the pheromone trail. Since I am sure Tyranids will get a bunch of fun stuff that can arrive in reserve in different ways, having that 2+ to arrive is almost an auto include in a army, now for the death leaper it could work if his rule was he had to stay in reserve then came in automatically turn 2 and then that rule could be used on turn 3, but anyways.
I like everything else for lictors it makes sense. I am also a fan of lictors too