Would it be a good idea to revoke three reforms to get rid of the +10% stability cost modifier as well? (given that heavy conquest game will rely on a fair bit of truce breaking)
I thought that doing this would make you lose all your Dip points because you'd have a ton of vassals, but when I tried it with the console just now, it still did not count HRE vassals passed through revoke the privilegia as normal vassals when you gave up 3 reforms so it's definitely possible. I would still advise against it as there are some draw backs:
- There might not be enough provinces in Europe to pass 4 reforms if you care about being 1 tag. You have all the electors under your control so you are losing .70 a month and would never be able to accumulate IA.
- New HRE vassals would count as normal and be a waste as you'd waste IA for them instead of for your last reform push.
- If you pass erbkaisertum, the religious strife period doesn't happen as this is an automatic treaty of Westphalia. Without it, the game might actually bug out as everyone who would be in the protestant league is already your vassal. It is supposed to become automatic Catholic dominance if the Protestants never declare war, but some people have reported that at least 80 years on it hadn't ended. It might be hard coded to end at some date, but you would have to check the game files.
- If you want to switch to a new religion to get other bonuses, you would lose the emperor title unless you wait for the potentially buggy 30YW mechanics.
Overall, it's still probably OK, but I personally wouldn't do it so I could avoid the 30YW mechanics. If you really want to stack -stab and not risk bugs, it would be best to only revoke only 1 reform then revoke the restraint of appeals and either switch to Orthodox if you want to keep trying for PUs or switch to Islam for Unify Islam after you get some of the Christian missionary strength decisions. If you change to Orthodox Italy, you can be stab capped with decisions, religious ideas, wine, and the fine arts academy. With the same things, you can also be stab capped as Sunni Austria.