ORIGINAL: Grant-KS
For adjusting low end, I adjust it according to transition. Try moving the stick from idle to half throttle quickly and see what happens. After the engine has been run up and cleared out that is. If it immediately dies, you're probably too lean. If it blurbles a bit, it loaded up and is too rich. I adjust mine so that I can idle it for about 25 seconds and have a good transition. low speed needle controls from idle to 1/2 throttle, and high speed from 1/2 to full throttle.
From what it sounds like, you're rich on the low end. Here's why I think what I do. You mentioned that throttling up it's fine once it clears out. If it's rich on low end, it will load up when idling, and when you throttle up, there's too much fuel in the cylinder. Also, if it's too rich when idling, it will load up, and once it gets enough fuel in there, it will extinguish the glow plug. Try running it with the glow ignitor on after the engine has been run up and see if you can idle it any lower. If you can, you're probably too rich. Also, if the RPMs drop when you remove the glow ignitor, that's another sign that you're rich. But, like jcmccorm said, we can't really tell which way your engine is right now, so just experiment a bit, but no more than 1/8 turn at a time on the low end needle. A little goes a long way.
I think you hit the nail on the head with the glow ignitor. I forgot to mention is seems like it idles considerably better with the ignitor plugged in. Which, like you said, would mean the glow is hotter to burn the overload of fuel easier. Once I take it off, the fuel cant burn quick enough so it loads up. So that would mean the low end is too rich..
I'll lean it out tomorrow and see what happens.
Someone at the field told me that the high end needs to be adjusted before the low end. Is this true? To me that doesnt make sense.. If the low end runs like crap, it may not even transition into the high end before dying..