“Holding a line” doesn’t mean running parallel to a painted line. “Lines” refer to the proper way to enter and exit a turn in order to maximize speed.

No.

HEAT is different than anti-ship warhead BUT even a small shaped charge is capable of penetrating 12” of RHA. The problem with advanced tech now emploeed is that it is ‘fragile’. Armor is great but systems don’t respond well to super heated plasma of any kind.