From what I can tell, SQ doesn't load Suite redemption availability automatically once they are scheduled to open up (350 days out). What seems to happen is they open up waitlisted, then become available a few days later. Unfortunately the interval seems to be totally random. I previously read somewhere on FT that they are manually loaded by SQ staff who do not follow a fixed schedule so YMMV.

How I suceeded in the past with Suites redemptions is to have a very open schedule and to check back constantly.