WG21 is like carrying around a heavy desert eagle .50 around that fires .22 short rounds and other rockets are like a .22 snub nose that hits like a 9mm loaded with +p load.
You take the performance hit for the huge size, weight, and drag penalty but you don't get the benefit of the much larger charge. (100 times larger in the case of RS82 vs WG21)
I haven't been here long enough to know but I will guess there was a huge gnashing of teeth when the small rockets made a small boom and the big rockets made a big boom.
The solution to the player would be to take the large rockets when you want a large boom as opposed to removing historic balance concerning explosive power.
The WG21 could easily be brought up to it's historical power without unbalancing the game by simply removing the contact fuse and use only the timed fuse.
It's no coincidence that the rockets used the most are the ones that overperform vs thier real life counterparts.
Just what do you think HTC should have all of the rockets set to? You cant just simply make such a broad statement and expect to get HTC to review the situation. Remember what I've said: HTC has everything based on a scale. As to why they have chosen the damage values that they have for the rockets and bombs is theirs to know and ours to speculate. There are many more things at work here than just the weight of TNT.
I've also suggested that you NOT choose the typical air to ground rockets to compare with the WGr21 rockets because it is like comparing a Star Wars Storm Trooper vs a Teenage Mutant Ninja Turtle. The WGr21's are in a league all their own. If you want to compare the IL-2 rockets, then the following are in the same category:
RS82: 93 lbs dmg
RS132: 120 lbs dmg
4.5 in: 120 lbs dmg
5in: 156 lbs of dmg
3in/60 Pdr: 187 lbs dmg
Pb1: 93 lbs of dmg
All of them are legit air to HE ground rockets (3in are SAP), with the Pb1's being meant for the anti-armor role though I'm not exactly sure of the warhead (AP, HEAT, etc, ???), they do quite well in their designated role.
Again, notice anything about them in general? They fall in to the "2, 3, or 4" category in how many are needed to bring down the typical OBH with a 312 lb hardness setting. Where the better rockets are really felt is when being used vs a hanger, SB, or other such hard target. The 8/3in rockets from a Mossi or Tiffy off more than 350 lbs more damage than a pair of 500 lbs bombs.
If you are on a crusade to change the WGr21 rockets for whatever reason, I suggest you think things over thoroughly and figure out exactly what and why you think it needs to be changed.