I'm kinda like you,I only have 2.5 gallons through mine. I finally got to race it a few weekends ago and used the 6.5mm insert which was good while the track was dry. My tune was changing a lot(may be AE fuel tank,gonna try xray tank on next outting) and right before the main it rained and made the track muddy. About 3 minutes into the main I overheated and died. After changing plugs and richening the main, I got back into the race but my engine was very weak on bottom(like too lean) and the main was very rich. I gonna try the xray tank and start with the 8mm insert on my next visit to the track. My needles are about the same as yours. I run 25% fuel and had the odonnell 77t plug in. I'm thinking the 6.5mm insert and the muddy track was most of my problem. Thanks for the info.