Maybe the person with rpg should be marked ^^Idk how hard it is in terms of actual implementation but for the web bomb, you could make it so when someone is hit, if he touches other hiders they get tangled as well (for the duration of the effect), this will make everyone run away from "infected people" this could easily be too op though, should be careful with timings.
Another thing could be a "double agent" role for one of the hiders, where his goal is to "mark people" and if they get killed while marked (which can be a short wh for seekers) he gets a point or smthn (perhaps something at the end for leaderboards to not mess with cage too much) might be hard to implement as well though.
Most OP weapon vs woolheck, can be a nice balance
Nice idea's though