So in my game 3 position which I took to learn the ropes, I've implemented the norfolk system, which hasn't seemed to impact my EH at all really yet, though it was only just implemented.
I asked this last turn about going to milled coins and also of revaluing coinage.
For the papal states in 1738 to introduce milled coinage would cost £1.8M, and to revalue the coinage from livres to pounds at the same time would cost an insane £30M. (perhaps the 30M isn't so insane to some but it is many times the full annual income of the papal states. I think EH would have to go to 11 to make it worthwhile!)
I think I will implement milled coins and see if that can help improve our EH. My guess is that being corrupt Italians, that raising EH for us is harder than honest hard-working protestant states like England :-).
What's other people's experience been in trying to raise EH? What has worked, what hasn't?