your best bet is to go thru this thread and see if anyone else reported any jetting numbers on the PWK 28 ?
https://www.blasterforum.com/threads/jetting-numbers-the-solution.17259/
but nobody can tell you exactly what jetting you need for your exact mods, elevation and temps
you need to fine tune it yourself
with that said, I know the pwk 33-35's like 45/48/50 pilots, DGH or CEL needles and 148-158 mains
I can't see the 28mm needing that much leaner jetting as your attempting to use
forget the main until you get the, float height, pilot, and needle jetting correct, then plug chops for the main jetting last
1.5 turns out on the airscrew is a starting point,
turning the airscrew in richens the circuit, as it controls air not fuel
1/2 turn is less air than 2 turns
if it won't even idle between 1/2 and 2 turns out, you need a different pilot (my guess is larger)
jet in this order, get one circuit correct before moving on to the next
1.
https://www.blasterforum.com/threads/float-heights-and-how-to-adjust-them.50565/
2.
https://www.blasterforum.com/threads/adjusting-your-airscrew-pilot-jet.51060/
3. i'm not sure of the needle required on that 28, I know you can fry it at 1/2 throttle with the wrong one
you can do 1/2 throttle plug chops following the procedure below exactly, but at 1/2 throttle
4. main jetting
https://www.blasterforum.com/threads/adjusting-your-airscrew-pilot-jet.51060/