What CMDR lowest said is the best tactics if you don't want to fight.
While full SYS pips will help you to keep your shield up a several seconds longer, full ENG power will, in the same amount of time, get you from the optimal firing range of your attacker, so you avoid damage altogether, plus will get out of their mass lock before your FSD is ready, again.
And it can't be stressed enough - For NPC interdictions, always submit. You will avoid the hull damage from emergency stop and your FSD will cool down way quicker.
Players are another thing. They are usually smarter and can boost after you, so you might want to actually win the interdiction minigame.