despite all the griping and hate, I have had good luck w/ efests (even the ones marked 35 a)
in a regulated device, its not going to be a big issue. at the worst, you should get less batt life. its not like you are running a mech that has no safety features built in. and id be fine using them for mechs, just wouldn't go below say .5 or .6 ohms.
We have about 8 of the 30a purple Efest that have been in rotation through several mods for over a year....waiting patiently for the doom and gloom to start.