Bad Tooth

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Hi guys, I have been reading through a lot of threads that deal with DLE 20 problems but haven't found an answer to my problem yet, so I thought I would start a new thread.

Brand new DLE 20
Xoar 17x6 prop
A-02 ignition
4.8v ignition battery
NGK spark plug
Fresh fuel 32:1, 91 octane (no ethanol)
Using a starter
Carb needles (H,L) are close to factory recommendations
Running mounted to the airframe with no wings

Here's what's happening:
To start it: close choke, throttle open, turn over a few times with the starter. Open choke and throttle at half throttle. It takes a bit with the starter but it always starts after this.
It runs fine above half throttle. Transition is good from half to full and even idle to full as long as I don't hesitate moving the stick too long. If I go straight to idle it seems to idle fine. I notice idle and WOT changes as I lean or richen the mixtures. It'll run all day above half, and idle all day at idle.

If it sits at idle too long and I try to advance the throttle - it dies
If I get down to half throttle and slowly decrease the throttle - it dies - shortly after passing half way.

I haven't seen any change in these symptoms adjusting the needles, it always seems to be the same no matter what I do. Won't run between 1/8-1/2 throttle.

Any ideas?? Ignition??