You haven't mentioned how much Nitro you are using in your fuel...I would not hesitate to increase it to 15% if you are not already there.
This will probably help smooth out the transition from idle to full speed and help stabilize low idle.
There is definitely a noticeable increase in power with higher Nitro %.
I only have one Saito engine ...the 220 Single cylinder beast...I kept having deadsticks until I really leaned out the HS needle...it still leaves a good smoke trail.
I couldn't believe running fat this was the cause of my problems being so counterintuitive from years of OS engines .