Hello there. This is a very common issue when making flatbreads like chapatis at home, and you are completely right to avoid dumping in excess raw flour, as that truly does make the finished bread tough and dry.
The primary reason this occurs is that flour hydration is not one-size-fits-all. Different brands of whole wheat flour (atta), milling fineness, protein content, and even the humidity in your kitchen affect how much liquid the flour can hold. A standard recipe ratio provides a baseline, but the bran in whole wheat takes time and mechanical work to absorb water completely. Until that moisture is bound inside the flour, it sits on the exterior, creating that sticky feeling.
Here are a few simple steps and reasons to help you fix this easily:
1. Use a touch of oil or ghee: After your initial knead, apply about half a teaspoon of neutral oil or melted ghee directly onto your palms and work it over the dough for another minute. Fat creates a light barrier that immediately keeps the dough from clinging to your skin while locking in moisture.
2. Watch the damp cloth: If the cloth is too wet, it transfers moisture back onto the surface during the resting phase. It is often safer to cover the bowl with an inverted plate or plastic wrap to trap the natural humidity without adding surface water.
3. Allow sufficient resting time: Giving the dough twenty to thirty minutes of resting allows the starches and proteins to fully relax and drink up the remaining water, naturally reducing stickiness.
When you roll them out, lightly dust the individual dough ball in a shallow bowl of dry flour rather than kneading dry flour back into the main batch. This keeps your chapatis tender, soft, and easy to handle.