Thanks for the suggestions guys,

I looked at the thermocouple. The instructions state it should be 4mm. I reckon its possibly slightly more, maybe around 6mm at the most. Would that be significant?

I have done the mod with the hatch to prevent hot gases. Ive included a pic, in case mine looks insufficient, but i cant see how i could restrict it further.

Oddly enough however, the hatch does seem warmer after flying than it did when i had the 54 mk2 in there.

I just did a test run on the ground with and without the hatch on and got the following.

Idle max EGT during spool up max EGT at max rpm

600 680-720 640 without hatch
640 750 670 with hatch

I wouldnnt have thought this was significantly different.

Ive got air screens on the top of the hatch, so id dont suspect im starving it off air.

Heres some pics of my setup in case im missing something.