dspr - Rob at Coherent Source Service could check your serial numbers for whether yours were upgraded to the "i" status. The difference was upgraded woofers and possibly an XO tweak to compensate.
I communicated with Rob and shared pics. He confirmed that my Thiel's are CS5i's.
Makes them that much harder to give them up.
Guess I will try moving them around again and start by placing them a bit closer together although I recall I tried that and did not like it.
Thanks for listening,
Dsper