play with the metering lever and needle. i thnk the walbro sites say it should be perfectly flush with the area around the needle. once you tear it apart you will see what i mean. i didnt use any special tool just a small flathead screwdriver to pry it up a bit and that opened it up to draw more fuel and fix my problem on a stubborn walbro.

my bet is that will fix it. i bet your ign system is fine. make sure the gap is set to a business card thickness and play with the carb ;-)