Its a typical thing, that the idle hangs after doing steep climbs with much throttle.
Provided your pilot circuit is okay, you could also try following.
With engine fully(!) warmed up check how it idles. 9 out of 10 smokers I get into my hands have a too high idle. Set the idle as low as possible, it is acceptable if the engine stalls from time to time.
Once the idle is set as low as possible go riding and try exactly that steep climb and see what it does. If the idle still hangs turn the As in a 1/8 turn and try again. Repeat until the idle hang stops, re-adjust the idle if necessary.
When you are ready and the idle stopped hanging consider your AS setting. If it is less than 1.25 turns you could try the next bigger pilot jet as Jakobi already said.
Don't forget that on most if not all two strokes it takes longer than on 4 strokes till the revs drop down to idle speed. That's a feature
