Not sure which Ringmaster you have but I do have and actively fly a Jr. Ringmaster (it is the .20 sized profile version) and an S-6 Super Ringmaster (that is the .35 sized full fuselage version). In addition not to long ago I did refurbish and fly a friends S-1 Ringmaster (that is the .35 sized profile version).
There also was the Baby ringmaster, Imperial Ringmaster as well as several others.
Anyway it is my opinion that the three versions I have been involved with are best operated at about 10 to 15% MAC not the typical 25% of the RC airplane. This is actually quite close to the leading edge. Both of my rings are quite aerobatic at this position. Also both of mine have RC engines (in fact all my controlline airplanes do) the Jr has an OS .20 with muffler of course and the Super has and RC .25 Hirtenberger.
John
Here is my little Junior: