G'day

Most of the time your servos are drawing very little current. They are only pulling a lot of current when the servo is stalled or at near full power. In a trainer that is flying normally, the load on the servos is quite light. Do a loop and you pull a bit more current, do a really tight turn - ditto - but most of the time things are pretty quiet.

Start flying 3D and things get a bit different as the servos are working all the time and several at a time as well but in your trainer, I think your basic setup should be fine.

For this reason, your servos should be connected to control surfaces that move freely so that the power the servo generates is going towards moving the surface against the air and not against friction in the system. If a servo is quiet, it is not using a lot of current. If it is chattering or making other noises, then it may be.

You have a "normal" 40 size trainer with "normal" servos, a "normal" battery etc etc. It should work perfectly unless there is some serious problem with one or more of the electronic bits. I suspect there is no problem.

Or in the words of the late great Douglas Adams "Don't Panic."

Keep having fun. That's what it is all about.