You didn't mention if these PAWs are new or have been broken-in. If they are new and you only have a few minutes on them, I would suggest further break-in on the ground.

For the one in the plane, just run it at peak for a minute or so while holding the plane, then pull the fuel line to shut it off and let it cool for five minutes or so to heat cycle. Do this about 10 times. That will condition the piston/cylinder for maximum life/performance. Most iron/steel diesels do not heat up fully until they are run for a minute or so anyway. This will allow you to make adjustments to the compression and fuel so that you can get your best settings for when you launch.

As the engine is heating up, I like to back off compression and increase it to smooth running. You may have to adjust needle and compression several times during warm up.

Here is a diesel combat site that has great info on the care and feeding of diesels, especially PAW:

http://www3.bc.sympatico.ca/dieselcombat/index.htm

Good luck with your Ringmaster and PAW.

George