They should use the bonus damage code on shrecks/zooks imo just like they did for ptrs. Make them do 10 dmg with 110 bonus dmg (or less for zooks, dont recall exact value) to vehicles. Zook/shreck sniping should NOT be a thing.
btw on the historical/realism side of things these weapons operated on the principle of using a shaped charge (explosive) to focus the explosion of a normal explosive into a forward cone instead of a sphere, creating very high temperatures and melting the armor (and crew in the blast zone; if it penetrated the armor entirely) outright and burning anything near the blast cone quite badly. They did not rely on their kinetic energy to penetrate (hence the name HE-AT) and indeed had very low velocities e.g. 110m/s for shreck rocket compared with 790 m/s for pak40. The low velocity was the reason for their short effective range.
