I find #scheme and the specialized groups #guile, #chicken, and #racket (all on Freenode), as well as the very general group ##lisp (for all the Lisps) to be very good places to get input on a design question quickly, especially when you are in doubt between two equally good-looking options and are feeling like Buridan's ass.  If you don't want to bother with an IRC client, go to  https://webchat.freenode.net/ and log in with a nick and password of your choice.  I'd start in #scheme and branch out.