Faster bullets have a flatter trajectory. The faster an object travels, the longer it can stay in the air in a certain trajectory before being brought to the ground by gravity. If a character with supernatural strength could throw a rock at 300 meters per second, hitting something at 150 meters would be a lot easier. There would be a lot less arc to the throw.
Yet, a Strong character not necessarily moves extremely fast too.
Picture some really big, really muscled weightlifter type. He can move a lot of weight, maybe bench-press 500 pounds or something. But his musculature is not trained to move fast.
Now, give him a spear to throw.
I bet you anything, he can not throw it farther than an average Spear-Thrower athlete.
The Guy who throws spears is a lot less strong than the Weightlifter type, but his muscles are conditioned for "explosive" motion.
I think Strength provides enough of a bonus to throwing by expanding the variety and size of the weapons you can use.
And once you get to the big weapons, it really doesn't make sense to increase the range on those as well.
Strength determines
What you can throw, not how far.
Now, if you wan't to increase throwing distance on the fly, do a maneuver to indicate that you're winding up your throw. If i were the GM, i'd let you set aside the +2 bonus to increase distance by 1 zone.
Plus, it doesn't make any sense whatsoever that a character who can pick up an SUV with minimal effort would only be able to throw it 1 zone away. Especially since zones vary in size.
A Normal character can pick up a stone with minimal effort. He can throw it 1 zone.
A Super-Strong character can an pick up a Car with minimal effort. He can throw it 1 zone.
Your argument would have to extend to the normal character as well, why can he throw only one zone ?
I'd say it makes sense:
If both are equally trained at throwing stuff, then the distances should be the same, which they are.
The strong guy simply can throw bigger stuff than the normal guy.
If they train to throw stuff farther, i.e. take a stunt for it, they can increase the distance.
Ok, i hope this rather unsorted jumble of random thoughts makes sense to anyone... bye bye *g*