Have you got any N3xx needles? If you haven't tried one you should
With the zook needles you'll be able to drop around 2 sizes on the main due to the rich 3rd taper. I'd start with the richer needle diameter so NEDW#3. You'll want to go up several sizes on the pilot to maintain the same idle and off idle response. I'm thinking a 42. Move from NEDW#3 to NECW#3, then to NEDW#2 and evaluate which feels better. Even try the NECW#2 if you think there's room for improvement, but if may be a bit lean for your taste I'm thinking.
The other option is just stick with the JD blue and the light burble. They will all burble a bit on light throttle during transport. You either has have to keep the throttle open further or closed and no more noises. Haha! I know you like to tinker though and experience the differences in making changes. I enjoy reading the feedback too.