seems to be impossible for HEAT to penetrate this position,it must be wrong
also，I hope can add new functions in app，such as camouflage and 9-fitting-system，especially when player chose penetration boost
About this shot, I see the HEAT ammo on this screenshot has 238-635 loss of penetration power, that's because it first hits the spaced armor and there is a gap between spaced armor and primary armor and according to HEAT mechanics the shell lose 5% of pen power for every 10cm of distance. So combined with 314 effective armor it means the initial pen power should be above 500mm to have non-zero chance of pen.
We'll add calibrated shells perk for blitz tanks in the next version.