As I recall, in the past you had to make 3 to 7 offers, with between 4 and 10 fandoms each, and 3 to 5 requests, with 3 to 6 fandoms each.

Unfortunately, that makes it really hard if you want to read/write fandom A paired with either fandom B or fandom C, but have no interest at all in fandom B paired with C.

How about setting a slightly higher minimum (and perhaps a higher maximum?) number of requests/offers, but allowing those requests and offers to consist of 2 or more fandoms? That would allow for avoiding those matchups you really don't want, while giving more options.