never heard of anyone doing that, what does shimming the head or glow plug do?

I flew it two more times yesterday, after adding a small one ounce header tank, seemed to run better but still a 2 cycle. yuck, makes a mess. I love my 0s70 on my profile plane hardly any mess.

Anyways I flew the novice pattern it flys well I need to add some tail weight to it as its very nose heavy. but other then that it does fly nice.