I've got close to 20 tanks through the engine and I've been flying it on the Meridian using an APC 13X6.  I've switched over to Klotz oil still running 20:1.  I've tuned the low end in quite a bit from the stock setting and it now has a quick transition from idle to full without any stumbling or 4-stroking. I was afraid to lean the low end early-on but now after that many tanks it should be OK and it has much better transition response now.
The high end won't 4-stroke in the sir under load but when it's diving and unloading the prop it will 4-stroke a bit. Little movement on the high speed really does do a lot. I've not noticed any slop or leaking of the HS needle....yet.
Happy with the performance but I will be trying a Vess 13X6 to see what difference that makes. Also the exhaust residue has cleared up dramatically . It's a lot more than my other larger gassers but less than a typical glow.
I sealed up the stock muffler all around and it is holding up well....so far.   I also removed the plastic screen clunk and replaced it with a brass sintered clunk.