I still have a hard time with the RS82 rockets being almost 50% as destructive as the WG21.
The Soviets RS82's have 92 lbs of damage, while the WGr21's have 200 lbs of damage. The big thing to check in to is the amount of explosives, and the "type" of warhead projectile. The ultimate scale of how this stuff is rated is how it fits in within the "312 lbs" scale. Meaning, HTC has ordnance scaled as to not be over powering on the typical OBJ (ammo bunkers, barracks, radar mast, town building, fuel tanks, etc), yet give it the due it has coming. I presented to HTC some times ago the differences between the British 3in/60 pdr rockets and the US 5in HVAR rockets, and I believe Pyro was the person who adjusted in in favor of the 3in/60 Pdr rockets. Likewise, the US 75mm HE round from the M4/75 Sherman, that too was adjusted to reflect its superior HE capability to all but a few tanks in WWII.
Keep in mind that when comparing the German Wg21 rockets to anything, that they were designed and meant to be used for air to air purposes and that when used vs OBJ take it with a grain of salt because that is not a good base to compare to. For comparison purposes, keep the Soviet RS82 and RS132, US 4.5in M8 (same rockets on M4 Calliope as well) and 5in HVAR, and UK 3in/60 Pdr rockets in their own group as they are the true air to ground rockets in the game. The German Pb1 rockets are designated anti-armor rockets and do slight HE damage (too much, imo), yet will easily destroy any tank in AH with a solid hit. The German WGr21 rockets are air to air. The German 28cm Wurfkorper rockets are ground to ground and are devastating when used properly against a town.
In short, do not compare the Soviet RS82 rockets to the German WGr21 rockets, it is worse than the apple vs orange comparison.