Not trying to sound rude but it sounds really really really unefficient for tower taking to try to minimize how many people your guilds pk's. While defending, blocking can work without pking, but they often times try to block you out of your flag room and storm the flag room. Are you gonna hope they all just kill each other up there?
While attacking they will definetly have numerous people blocking the flag room entrance. Are you gonna hope some pkers get thoes blockers for you?

Trying to take towers without going and and planning on slaughtering the enemy team sounds like a pretty bad idea. You just wont do as good as you could be doing.

Also, im pretty sure hitting flags lowers AP as well as hurting people. I could be wrong tho