Affliction is powerful in that in bypasses Damage Resistance. You can target the seemingly invulnerable types and take them out, which is the end result of a Stun test. If you want to send people flying, you'd need to chain an additional effect (power) to your attack. Your GM might let you add it as an Achievement.
So, since a Limit could directly "pay" for an Extra, you could add an Extra like Strike (if you want to do even more damage) or specifically a Slam-inducing effect like Air Ram (from Spinning) and balance it with a Limit, say, Degrades.
Extra: Secondary Effect (Air Ram); Limit: Degrades
You'd roll up your Affliction, then you'd test your Air Ram effect vs the target's STR for a Slam. Each page your Air Ram rank would decrease by 1 (starting at your Affliction rank of 8).
Of course whatever power you add should make sense for your character concept. Someone with Training, high Prowess, and Affliction could sound like a Chi warrior (the Affliction is a spirit punch, which is why it ignores DR). It would make sense for it to not send people flying. It's an effective power! Just be glad you didn't roll up the dreaded Dream Control!