FastSky,
Please post some photos of these stuck Super Tigres if you would. I have many Super Tigres and they are great. The engine out, dead stick issue in Super Tigres is usually due to the low end out of position, too much nitro in the fuel, too lean, or wrong glow plug. I usually put an OS #8 plug in, run Wildcat 10% Notro with 16% Castor, and run the engine just a tad on the rich side. As far as the barrel sticking, this may be from Gumming Up of the carb barrel from whatever fuel you are using, or there may be a burr or nick in the barrel slot. A little pollishing may resolve this issue. I have a Super Tiger 90 2 stroke in my 1/6th scale Pica Waco YMF5 that weighs 11 pounds. That engine can pull that gal through any maneuver I put her through with power to spare. Good luck to you.