Welcome! boilers1
I have had the pleasure of listening to the Rega Elicit -R integrated on different speakers that sounded pretty good. Thiel speakers crave high-current. I am interested to learn the current output of your Rega?
It could be that the volume has to increase to gain a certain output level?
My first CS 2.4 listening experience was with a Creek integrated that did not have the power of your Rega. Remembering back, I did adjust the volume to musical taste. Hope this has been helpful.
Happy Listening!