Well I haven't seen this exact kind of incident but I've had a lot of trouble with the RPG-29. At least since patch 1.08, I've noticed it seems to be extremely underpowered as well (For example, T-72s surving multiple hits to their rear armor). So I'm not sure if the PG-7VR is actually any worse than the PG-29V, it's possible both have been seriously nerfed.