It's now 1593 in my game and a lot has happened.
I integrated Novgorod and converted almost all of the provinces to Protestantism. I've had to put down a couple of patriot revolts in the process, but my force limit is now over 100 and my manpower pool is 120k, so this isn't an issue at all. Defender of the Faith was enough for the conversion, along with the basic +conversion rate decisions.
Surprisingly, I managed to win the first Religious League war. Only problem was Bohemia became Emperor. I really should've been more careful by spamming alliances/royal marriage/guarantee/improve relations with electors to ensure that I was chosen. And once this happened, the Religious Leagues were still in effect with Protestantism as the defending religion so the Protestant electors that were part of the league had an extra +200 toward Bohemia for the purposes of imperial voting. Anyway, the second Religious League war happened only a few years later, made up of some of the Catholic powers that hadn't joined the first war and Bavaria/Portugal which had been on the Protestant side in the first war -- the major Catholic participants of the first war weren't involved initially due to the peace treaty and joined in after it'd been going for several years. It was a fairly easy win and Protestantism is now the official religion of the HRE.
Bohemia awarded me a lot of territory during the peace agreements during this second Religious League war, which was a mixed bag, but I did manage to get Cadiz and Corsica for the naval supplies, and Gelre for access to the English Channel trade node. In my next war, I fought a coalition of minors and seized all of Pomerania, Utrecht, Danzig (separate war), and gave Finland the rest of the Livonian Order (which was Courland now because I forced them to convert to Protestantism earlier).
I moved my trade port to the English Channel and set my fleet of 150 light ships to protect trade, and now I'm richer than everyone other than Castile (175 ducats/month for them, 150 for me, GB/Portugal/Ottomans are at 115) -- I'm still collecting in Lubeck because I have 50% of the trade even without a fleet, and in total I make 100 ducats from trade. Collecting in the English Channel is fantastic, and I think everyone who plays Norway should aim to do this by 1600 when NA/SA/Africa start sending significant amounts of money trade to the end nodes. Mainly because trade power in Lubeck doesn't propagate to the colonies via the "downstream trade" modifier, while English Channel and the other end nodes also give you extra trade power in the Caribbean/Ivory Coast, etc. Due to my massive colonies, trade company in South Africa (which I took from the Spanish) and exploration+quantity, my naval force limit is 360 which I haven't even had the time/money to max out (GB has 250, Castile 230, Portugal 220 -- and this is including the 50% AI Bonus from Hard AI). I only have Utrecht/Gelre+trade fleet in the node, but I still control 48% of the trade and make 58 ducats there (GB makes 45). Another great part of collecting in the English Channel is I've decimated Burgundy's income: they only make 15 ducats from trade there, where previously they were making 40.
My alliance with Great Britain really paid off because I received a PU with them around 1585. Now I don't have to worry about their colonies with naval supplies, and I can let their heavy ship fleet fight my battles against the Iberians.
After my conquest spree in northern Germany, a coalition formed including Poland/Lithuania (broken alliance and they wanted Danzig), Hungary, Austria, Burgundy, and some minors. My allies were Bohemia, Great Britain, and a couple of minors. We were outnumbered something like 3:1 in the European theater. Fortunately, I had 100k troops under my direct control, so I wiped stacks when I could and otherwise played defensively and let attrition take its toll. Quantity+holding Russia allowed me to maintain a large fighting force more easily than my enemies, apart from Burgundy and its 60-70 mercs -- I ended up sitting my stacks near Cologne/Utrecht and wiping Burgundy's reinforcements while I waited for the other enemies to move a stack out of position. Great Britain initially landed troops in Italy/Austria which just resulted in getting wiped, but once I began fighting in Burgundy itself, they landed 40-50k there and I could finally coordinate with them. Well, the war ended in a white peace after 6 years, but I count that as a major win given the situation.
I plan to spend the next ten years playing nice in the HRE so I can get a shot at Emperor, so I'll probably beat down Nogai and take the Russian culture provinces they captured from Muscovy. These last 30 years have seen some really fun wars!