Not that my opinion matters entirely much (Being my first post and all), but a suggestion.
Perhaps:
50 - 75% income from core provinces w/o TC.
25 - 50% income from non-core provinces w/o TC.
I think this would accurately represent the less efficient tax collection mechanisms in place before the promotion of tax collectors. It would still have the effect of making the player make a balanced choice on whether the benefits of promoting a TC outweigh those of not (no +3 RR). As it stands now, it's a no brainer to promote TCs regardless of the situation.
Perhaps:
50 - 75% income from core provinces w/o TC.
25 - 50% income from non-core provinces w/o TC.
I think this would accurately represent the less efficient tax collection mechanisms in place before the promotion of tax collectors. It would still have the effect of making the player make a balanced choice on whether the benefits of promoting a TC outweigh those of not (no +3 RR). As it stands now, it's a no brainer to promote TCs regardless of the situation.