Cheating; no, Cheesing; yarr.
And I expected pretty much that reaction and here's the explanation: Since the httt april patch you can release a vassal and loose 2 BB / province released. And yes, WC is all about BB management. Atm I loose about 2 / year (.8 cardinals .4 embassy .8 advisor + ruler). All provinces outside of europe can with holy war be taken for 1 infamy or less each (colonized for 0 infamy ofc). MOST provinces inside europe has this far been taken for < 2 infamy each either by vassalising 4+ provinces for 4 infamy and then diploannexing for another 4 infamy. Castille, aragon and denmark is / has all been in a pu with me and with the fabricate spy mission those provinces were really cheap (aragon owned all it's original provinces + italy + greece). Portugal is the most expensive one and that' 3 infamy / province (3 x 4 infamy = 12 for 3 provinces +4 for vassalising and +4 for annexing)
Now let's look at how much infamy I can currently burn / year; each 6 year cyckle roughly I can release vassals for instance portugal + wales + scotland + 3x french 3 province states witch adds up to 23 provinces = -46 infamy. And since I have cores on all the provinces I can just insult them twice + cancel vassalisation + attack and annex for 0 infamy. This all adds up to about -10 infamy each year. The big limiting factor here is ofc diplomats. In the beginning I was releasing the irish states + cornwall + wales + champagne (=12 provinces). For whenever I take to many provinces and can't burn down to <5 infamy I can release some random heretic nation whose cores I won't miss (that I can reconquer for half the infamy I released it for).
Add to that I've done about 10 WC before +- and this is my 4th one with england so I'm not making many misstakes
edit: didn't see traj's post; at one point I was getting over 4 colonists / year from horde nation borders and COT's add to that very easy dificulty giving .5 inflation reduction.
edit 2: