I've killed a few Ta-152s by getting them to stall. The stall is just as wicked as you say, and once they go tail first it is over.
The 190 series was designed to fight from the top, down. It is all about speed, hit hard and get out of the fight. The roll rate was very intentional. Trying to fight the 190 as you would a Spit is fun but don't get discouraged when it doesn't end well. I've been flying the 190A5 for several months now and finally have the hang of it with a decent K/d above 2 but still ultimately lose at some point on the deck.
One note about high alt buffs. The ideal envelope is to dive from above. This gets tricky as the Ta-152 can compress stall amazingly quick at those high alt speeds. Another tactic is to start a couple K above them, dive down at high speed until you are perfectly level with the buffs then slash across them horizontally. With practice you can kill almost as easy, though not quite as much trigger time on target as a verticle attack.