You can either 1) throw a hissy fit, 2) adapt and design some new battle wagons of your own with range 18 weapons, 3) learn some new tactics, 4) restructure your fleets, 5) all of the above.
Or, (6) you can recognize that the game is meant to be balanced regardless of the ships used. Long-ranged weapons are not a 'tactic' -- they are technology. And while tactics do involve the effective use of technology (and reaction to that of your opponent), any technology that gives you an automatic (or nearly automatic) victory if I don't also have it is by definition unbalanced.
Range 24 and range 30 weapons already have an added cost to them (an extra multiplier than just range), they do not need any more adjustments.
Perhaps, perhaps not. As I've said over and over again, I'm not sure there is a need for further adjustment... but responses that essentially boil down to "long-ranged weapons are an advantage -- get your own or get over it" fail to grasp the point of this discussion.