oh i see i see

Usually running high nitro requires a cooler plug. You might be able to pull out a little more power and engine consistency with a colder plug

heres a short guide from os:
[link]http://www.osengines.com/accys/glowplugs.html[/link]
[link]http://www.osengines.com/accys/choosing-glowplugs.html[/link]