That burble, and the "high idle hang" are your 2 options here. If the engine is rich enough to come down to an idle reliably, it's very likely rich enough to have that burble in mid range.

Honestly, with that high idle hang doing it's thing anywhere on final, most guys will go for the burble rather than face the uncertainty of the idle thing, especially with it's habit of doing that on final. For that reason, in my mind anyway, burble is the lesser of the 2 evils. Burble can often be minimized noticeably by opening the plug up to .025". For whatever reason that wider gap will burn the rich mixture more efficiently.

What club do you fly with? I spend the winters flying with Tri County over by Dunnellon. -Al