before the new change to the look and model of the infested ancients, it was very easy to aim for the bottom parts of the feet where the weakpoints are. Now, it seems my bullets don't always hit the very bottoms of their legs anymore, which is a problem since i have a banshee and sometimes sonar places the hitpoint on the bottom leg and i cant ever hit it. It also appears that the weakpoints have moved up to maybe between the "knees" and the "waist" of the ancients instead. I assume this is a problem with the new meshes, maybe because their legs are all rubbery like and thin, but it can be very frustrating.
When using my hek or sobek, i am forced to aim higher then what the weakpoints should be at or my bullets will go through them and appear to just hit the ground or floor behind them.