quickness spell increases defense a bit .
att / def can never be high enough . you need good protection perhaps too when your enemy doesn't use scs but tries to swarm you .
early game f9 bless / x-bows are quite scary for low protection sc's because of their ap . when you fight lots of swarmers ( ermor etc ) some of them will always hit no matter how high your defense is . so you need protection against that too .
in 1on1 fight against scs protection is not so important because they can use AN weapons .
there high att / def Ratings are more important .
against undead scs you should consider regenerating items or you need to kill them quick otherwise they will always replenish their life by lifedrain .
building the perfect sc is hard
you need on the one hand a sc against hordes of common troops and on the other hand an anti-sc sc .
the anti-sc with an weapons might get killed by 100 units because of swarming while the standard sc can kill them easy . but the standard sc though gets killed in 1on1 combat by the anti sc .