It almost sounds to me that you might be a little rich on the low end, but too lean on the top end. When you idle it could be loading up which would allow you to run at higher throttle for a short period, then the lean top end would cause the engine to die. I don't know you might try making the high end rich first and not worry about the low end until you get the engine running reliably at full throttle. When you throttle up the engine, do you notice it making smoke, then does the smoke go away before it dies? If you lose the smoke in your exhaust before it dies, you are most probably running too lean on the high end needle.