My hair feels greasy immediately after washing - right out of the shower. Is this the adjustment period?

No - this is a different issue. If greasiness develops hours after washing, that's scalp adjustment. If it happens the moment you step out of the shower, it almost always means either product hasn't fully rinsed out, or there wasn't enough product to do the job. These sound like opposites but produce the same symptom. Try this: use more product, cover every part of the scalp, then rinse for a full two minutes while actively working fingers through the hair - not just standing under water. Add a small amount of water to the product during application to lighten the texture and improve rinsing. The nape of the neck is where product most often stays behind. If this doesn't resolve within a few washes, consider switching to New Wash Deep Clean - the most clarifying formula, which works especially well for high-sebum scalps and in hard water.