OK, so you have carb heat - the Aeroinjector doesn't require carb heat. Could this be 'opening' un-commanded? Maybe not if your RPM is 3100 throughout the pattern.
As asked by Xsonerai - what is you CofG.
Also, have you verified your propeller pitch?
Myles - three things:
1. do you still have the carb heat attached to the Aeroinjector?
2. have you checked the vent line for a blockage?
3. check the mixture controls on the carb are tight and the idle adjustment screw
Use half a tank of gas for the next flight.
I don't have hot start problems. I have wrapped the fuel line with aluminum foil. Try that and if the problem continues turn the fuel off, mixture off and crank the engine -this will pull through any vapor in the fuel line. Then start as normal.
My first landing at Chino in the Sonerai (and first flight post restoration) followed a couple of hours in a Decathlon after not flying at all for 3 years and about 30hrs TW total. The Soneria took care of me!
I recommend taking several runs down the runway with power and then cutting power -...
I changed the cowl looking for the optimal sized exit and added a small 'flap' underneath to disturb the airflow and help the exiting hot air. Smokey has some good posts on this. I think he used VG strips. This dropped my CHT's 20+ degs. Also sealing the cowl gap behind the spinner took off...
Chucker, your numbers look OK. Remind me - is it a new engine?
My temps on a FL summers day run in the 340-365 range at cruise and oil no more than 190 but my cooler works particularly well. Its bottom mounted with 'smiley' air ducted directly through it.
685L (low wing) has a 3 inch raised Turtle deck and at 6' 4" I fit snuggly.
There are several pictures in my gallery showing a line up of pilots standing beside the Sonerai and also sitting inside with the canopy closed. This may give you a better idea.