The issue isn't whether we take Corsica or not in a peace deal, the issue is that unless we send, oh I don't know, about our entire army of 100,000, we WON'T be able to take Corsica in the war. And Corsica is the only land that Genoa has left besides her home province. Thus, to EITHER force-vassal or take land from them, we'd HAVE to conquer Corsica in a battle. While, I guess we can ultimately, the cost would be enormous. Everyone here knows that my family has personally contributed to all of our wars and we never shrink from that responsibility, I can see absolutely NO reason to send 10s of thousands of Venetian young men to the deaths for that silly island. And again, if we don't take the island, then all that will happen after we conquer Genoa itself is them rejecting every peace offer we send and ultimately us just taking ducats. That will do nothing but hurt our reputation further.
Wait on Genoa my friend; ultimately, something else will happen. It so often does in life and world, and somehow, someone else will be in a position to conquer Corsica for us, or at least send 10s of thousands of their young men to their deaths and perhaps take the Genoans with them.
As far as Poland goes, you have a higher estimation of our diplomatic ability than I. And with the 100s, perhaps 1000s of ducats you want to spend there on perhaps a fruitless task and on that might worsen our situation diplomatically around the world, I would rather build a manufactory or build up the needed fortress in Tyrol or try to do something good in the world like convert the misguided around the Nile to the true faith or increase our small colony in India. Do not put too much confidence in the Poles; though they are large now and perhaps would be a tough advesary, there is no guarantee that they can maintain that large empire. They face many enemies around them and they will be in wars which we should care nothing about.