The total damage is
(weight/200 lbs)d6 + (height/10 ft. − 1)d6
except that the (height/10 ft. − 1) factor is limited to a maximum of 20. The (weight/200 lbs) factor is not limited, so the overall damage can increase without bound as weight increases.
We know this because the
(to a maximum of 20d6 points of damage)
parenthetical is specifically included in the sentence about height. A limit on the total would be indicated by a separate sentence referring to the total. This limit also mimics the 20d6 maximum on the damage taken by a falling object or creature, and both 20d6 limits seem to be the implementation of terminal velocity (and, roughly speaking, it successfully implements a reasonable abstraction for that).
My character weighs 16 tons
Then the damage is
(32,000 lbs / 200 lbs)d6 + (height/10 ft. − 1)d6
160d6 + (height/10 ft. − 1)d6
And at 210 ft., the maximum, the damage is
160d6 + (210 ft./10 ft. − 1)d6
160d6 + (21 − 1)d6
Which has an expected value of 630 damage. Sizable, but not ludicrous. These same rules are abused by the so-called “war hulking hurler,” who combines the hulking hurler and war hulk prestige classes, and has strength enough to throw moons and planets. Those do deal ludicrous damage. And also serves as a fine example of why these are broken rules that probably should not be used as the cornerstone of a character’s tactics. They do not work very well.