When you mention " it was really big" do you mean the pitch had a dynamic looping travel path to the plate? If so, remember how you did that. A wide looping action to a curve ball does have a slower motion to it, but, it can be one of the hardest pitches to perceive and judge. That kind of dynamics places a lot of judgement calls on the batter to wait... and wait... and wait, then pick just the right path and spot in the balls incoming action, to swing the bat and make contact.
Try this, pitch some limited BP to your teammates and see how they react. Couple this pitch with your practice to deliver a "tight bite" curve - not a slider. See how they adjust if they can.
If you can manage these two pitches, along with others, you're going to be one tough cookie to deal with.