My suggestion for swf

Elvenmonk

Swfs basically get bond for free and kindred. Okay.

So, let's give killers bbq, with no bp bonus, against swf.

Here's how it works:

4 man works like normal

3&1 hook player a you see b&c but not d. Hook d you don't see the swf.

2&2: hook a see b but not c&d. Hook c see d but not a&b

4 solo nothing.

This way you're only punishing that group for the info that they get. It doesn't harm solo at all either.

Edit: you can even make it bbq t1 or 2 as to not make bbq 100% worthless against a 4 man