I was just thinking today- we have an HP (+10 HP) reward via Agents of Argo favour...
Why not an SP favour reward, like +20 SP?

Just an idea, but I think everyone agrees that higher level favour needs a look at and this might be a nice option.

20 SP wouldn't be too overpowered- basically, it's enough to cast one resist.

That's my teeny-tiny thought of the day.