Don't forget what the folks above are saying...
Strong is relative.
A sincere, commited attack does not mean hard, fast, strong, etc. It can (and should) include those qualities when appropriate.
There must be energy to work with. If there is no energy affecting the partner, then there is no need to do aikido. (At higher levels of sensitivity the intent to attack and affect the partner is enough.)
Don't think about the technique the person is supposed to do...think about your attack and continue to be "dangerous."