You'd need to identify which Dynojet kit you have, but 4 turns sounds like a lot to me.
Lots of info on Dynojet's website but both Stage1 and Stage 2 kits say groove #4 (counting from the top) and start at 2.5 turns out.
https://dynojet.co.uk/media/attachme.../e7204.001.pdf
However, the air screws only affect ~ less than 1/4 throttle
1/4 -3/4 throttle is usually needle position, although this will be affected slightly by the main jets too.
Time to take the float bowls off and see if one of the main jets has come unscrewed? Although if you've recently had the carbs apart you;d hope not.
I assume running it with no air filter makes little or no difference?
Also what kind of exhaust are you running?