Mark is correct, that the needle and needle jet should not effect idle or just as you crack open the throttle, unless something is way off.
Is the problem just as you roll on the throttle? That could be the slide cutaway, but I'd want to get idle and mid range closer before buying slides. I have taken a file to slides to correct that situation before but I had a pile of slides I could offer as sacrifice.
Try a smaller needle jet and see if that's enough to clean it up. Jet's aren't cheap but cheaper than slides.....
But the big issue is 1/2 or 3/4 throttle IIRC. Did you check those needles I suggested earlier? I think I may have a pair here that I bought for some obscure reason and were never used - yet. They're longer so I'm not sure if they will work, but worth a try.
At 1/2 throttle it's mainly about needle and jet, but by 3/4 the main jet is exerting more influence.
Is the problem just as you roll on the throttle? That could be the slide cutaway, but I'd want to get idle and mid range closer before buying slides. I have taken a file to slides to correct that situation before but I had a pile of slides I could offer as sacrifice.
Try a smaller needle jet and see if that's enough to clean it up. Jet's aren't cheap but cheaper than slides.....
But the big issue is 1/2 or 3/4 throttle IIRC. Did you check those needles I suggested earlier? I think I may have a pair here that I bought for some obscure reason and were never used - yet. They're longer so I'm not sure if they will work, but worth a try.
At 1/2 throttle it's mainly about needle and jet, but by 3/4 the main jet is exerting more influence.