With the Juststock 45AMP works perfect in 1s applications I use it with no booster with my futaba reciever that works down to 3v no problem a new version transponder and a ultra fast servo. .06 sec at 4.8 vots so when down at the end of a run I'm down to 3.7 so it's a bit slower but it is super easy to drive.
Never had an issue with signals and transponder once I got the newer version. the old big ones don;t like below 3.8v.