Thats not "my issue", its a manufactuer warning not to use them with large engines or in high vibration environments.

My personal experience is that the output shaft shears off the top of the servo and or the output amplifiers up and die from vibration. Guys that have insisted on using them with 50 size nitro helis have found out the hard way that it's a lot more expensive to fix a crash than to replace a few servos.