Welcome aboard Chad.
Actually your idle speed should be 1300 (+/- 100) rpm. 1500-1700 is ok if the bike is happy with it. Something tells me you may have something going on if you idle speed was 3200 rpm and the tranny did not clunk real hard when shifting from neutral to first.
A high idle is used to compensate for poor performance in other areas. From your description (of the 'hunting' idle speed), you may have idle mixture issues or be in need of a valve adjustment. Neither of which Seafoam will fix alone.
Since you will be a way for a long period, you should use a good fuel stabilizer such as
Star Tron, Stabil or Seafoam to help keep the carbs clean. Ensure the mixture gets into the carbs. Storing the bike with
ethanol free fuel helps keep the carbs clean during long storage as well.
When was the last time the valves were adjusted on the bike? You may want to make getting a valve adjustment a priority and maybe clean the carbs if the idle speed does not improve afterwards.