Let's review again my previous post:

OSMG6304- #1 Hot plug for low nitro (0-5%).
OSMG6308- #3 Medium plug for medium nitro (5-25%).
OSMG6312- #5 Cold plug for high nitro (25% +).


If you run high nitro % and hot temperature in your area you have to use hot plugs, they burn all the time....exactly like you are experiencing

If you use low nitro, hot plugs can be used.

In Montreal area in summer like 20-30Celcius or 70-85 F, I use OS #8 with no problem at all on my OS 46 FX.

I even fly in winter with no problem temp around -10Celcius