Well if you’re looking for ‘raw’, then cross all the BMW’s off your list. M’s are for doing a lot of things well, including refined daily driving. And please dear God why is Lexus even on your list
Of the Porsches, the only one that really offers a ‘raw’ driving experience by my definition is the GT4. So I’d have crossed them off the list - EXCEPT you say that the 991 is perfect. If you love that car, then get it in manual. You don’t need the GTS trim if you want to save money. You’re not going to do any better IMO. The Caymans are more nimble and balanced, but the 911’s set the bar higher.