Great! So I'll try the "thinnned out" fuel before inserting the smaller carb restrictor. Nitro is still a bit high at ~6.7%; maybe I'll get some castor from SIG and bring down the nitro below 5%.

I'm running the Hangar 9 4-stroke glow plug (3011), and since the rpm doesn't fall off when I remove the glow driver, I figure it'll do the job. My guess is they are about the same heat range as an OS F plug.