This "answer" to the issue of a mini making a close combat attack against a target 4 stories above his head is a joke:
In a competitive setting, the organizer should determine
for the event if units can make attacks with Close Combat
weapons at any height, or at this limited height, to avoid
confusion.
Of course, you're not selling official expansions that have multi-story buildings with well-defined floors, so this issue won't come up that often… oh wait.
It's not the tournament organizer's job to avoid confusion, it's the designer's job.
Do the job that people are paying you for.
. After almost a dozen games it is no where near as unbalanced as it seems to be when first read (i was worried about it as well before playing). Giving all grenadiers grenades would unbalance the game. Giving all type 2 infantry (to balance giving it to the grenadiers) grenades makes it way to easy for infantry to kill/ neutralize vehicles and makes them useless in the game.