I'm having a really bad time getting my CHT and EGT temps down in my Jabiru 3300.  I did a lot of work on adding an extension to the lower cowl lip and adding a "fence" above various cylinders to move air back toward the rear of the ram air ducts.  I had moderate success prior to early April, but then went to Ireland for 2 weeks and returned to outside air temps that were 40 degrees warmer than when I flew last.  

Naturally, now my CHT and EGT temps are way too high.  CHT's are high on #3 and #5 and EGT's are high on #5 and #6.  

Today, I enlarged the Needle Jet from 2.85 to 2.90 mm and go some better numbers, but only could stay in the air for @ 5 minutes before the CHT's got dangerous, so I don't know how high the EGT's would have gone if I had flown longer?  

I was turning 3160 rpm at 70 mph climb-out.