Well, little update. Dropped the HRE, became Protestant, and allied with Lithuania all at the same time. Then had a hell of a war with Sweden, Spain, and Portugal where I took my core in Pommerania and spent forever trying to get Spain to agree to anything. The greedy bastards, I was destroying them left and right, and was doing guerilla tactics in Iberia all without them accepting anything short of conversion back to Catholicism. Only 3 Protestant nations that aren't OPMs atm - Lithuania, Burgundy, and me.
Somehow, I've managed to become allied with Bohemia again? I kept having the "You can not declare war on an ally" message when I was trying to use an alliance cb to help Lithuania. Therefore, they've lost like half their western lands, but whatever. Is it some sort of bug with Bohemia guaranteeing my independence after I beat Sweden and Spain?