Eric
I have Dynon 42L servos for pitch and roll powered through the ACM. They work just fine however I installed Ray Allen G405 grips and use the upper and lower buttons to actuate the horizontal actuator. Initially it was hooked directly through the ACM. I had two problems with this setup. First if I was adjusting the trim from stop to stop (on the ground, not in flight) the actuator would stop about half way through the cycle. It did not trip the breaker, it would just stop and I would release the button then hit it again to complete the cycle. Second problem occurred intermittently when executing a go-a-round, with the horizontal trimmed all the way down for landing, I would go to full throttle to climb out and trim accordingly. But sometimes the horizontal actuator would not work at all. That made it pretty hard to keep from stalling. When I got to pattern altitude on the down wind I would throttle back and found that I was able to trim.
I contacted Rob Hickman, president of Advanced Flight Systems, and told him about the trouble I was experiencing. The solution was to supply more amperage to the actuator using a TCW amp booster. He made up a three way harness that hooked up to the ACM, that way the G405 grips could still be used, then to the booster, and to the wiring for the actuator. It works great. The TCW product is called a Safety-Trim Intelligent Servo Controller Model #. ST-1-12v-10a-BSTR. Hope this helps.