Hand paddles can help a swim coach discover hidden technical flaws in a number of ways. So continue to progressively load volume and intensity to properly stress acceleration(s) specific to creating and sustaining maximal force throughout a stroke cycle. In order to find the flaws, simply be aware of any small pauses that are followed by 'excitable' movements.
On the surface, it would appear that force and flow are opposing dualities. But like many polar opposites, these two are drawn together beneath the surface because force(s) are always at play, even when we feel our swimming is at its most effortless.