You could try dropping the nozzle another round. Most people say that 2.5 is a base setting. That's where I started. Good luck.
Added info you most likely know already.
Setting Mixture
0. Warm up car
1. Screw both jets all the way up to the top
2. Screw the jets down 2.5 turns (default starting point)
3. Take the car for a run and listen closely for popping in the exhaust (rich), popping in the intake (lean) and note power
4. Screw both jets up or down 1/2 turn and take another run to see impact.
5. Repeat 3&4 and do 1/4 adjustments until you are happy
6. Take the car for a spirited 30min drive with plug wrench then while driving fast on a long stretch, hit clutch, kill motor then pull over to side of road, look at all plugs and compare colour. If there is a difference between the front 3 and rear 3 then the fuel jets need tweaking. Adjust the darker 3's carb by turning up the jet to lean the mixture a 1/4 turn
If all plugs are too dark then turn both jets up 1/2 a turn.
7. Repeat 6 until you are happy. All plugs should be the same colour and very light brown. Listen for popping out the front to tell if you go too lean. Don't worry, you can take your time and do this leisurely over a couple of days to fine tune and colour match your plugs.