Thanks, Dean.  However, the C11 is the mainstay as my main imaging scope and I have not had issues with error/flexure, especially after refitting the standard secondary mirror with the Optec secondary mirror fast focus system.  Issues like flexure, mirror flop, and shifting are essentially nonexistent, even after doing 10 minute guided exposures all night long.   Perhaps the added weight of the Esprit might change that and I would just have to test it.