Scaling to income isn't all that simple, although it would solve a lot. Vic income fluctuates daily, so the amount of money in question might quadruple depending on whether you sell those clippers or not.
EU2 has those superpower scaled random events, which are tied to number of provinces. That suits EU2, but in Vic the number of provinces isn't all that important. A 3-province state with factories and sulphur is a totally different thing than whole 15+ Algerian provinces with around 2000 farmers each.
Might it be possible to make a scaling depend on either overall or industrial ranking? If the effects are only economical, then using industrial rating makes more sense. Too bad that changes just about as randomly as daily income does, so perhaps the overall rating should be used. Would it be better to make the number of points or the ranking be the determining factor?