First off, Welcome to the forum DLHamblin!
The 2016 S1000 is indeed a bit taller than your 2015 GSX-R1000 but, not by much. The S1000 sits at 32.1 inches compared to the GSX-R at 31.9 inches.
Our lowered seat reduces the seat height by about 1.5 inches. Its best to request it ahead of time. It can be requested by calling our office at (323) 224-2734 before the event or as a last resort you can request it the day of the event during registration.
Looking forward to seeing you and your son in May!