Sniper knee, L2 no, actually I really wouldn't see a problem with L3 either however, I would have like to have seen the left side sniper edge (looking at it installed from the installed position) a bit more aligned with the shin return edge, but at this point I wouldn't touch it unless gazmosis advises you to.
Foam position, basically install your armor with the shin in its new position. Move your thigh around (forward or back) to find the sweet spot. Add foam accordingly.