Wasn't sore after Emsculpt using 2 paddles - should I be concerned it wasn't effective?

That's a valid concern, especially given you felt more sore after the session with only one paddle. That being said, it's worth noting that the sensation during and after the sessions can be influenced by multiple factors, including but not limited to the intensity of muscle contractions, individual pain tolerance (which can differ from day to day), and the specific muscles targeted. I suggest discussing your concerns with the practitioner who administered the sessions to ensure that the application was appropriate for your body type and goals.

I can't emphasize the importance of open communication with your practitioner, as they can adjust the treatment plan based on your feedback. If you continue to have concerns, seek a follow-up consultation with the practitioner to gain clarity on whether any adjustments or additional sessions are necessary for optimal results before you go through with more treatment sessions.

Ask to use the paddles designed for the waist. However, you should not be sore with or after treatment, even using the large paddles.