Try her again . . . Fixed the thruster heat issues and the lack of thrust of 20 m/s on one axis. She now has 18 m/s Lateral, Top, & Front thrust, with 31 m/s Rear and Down. Still only 4 thrusters in each direction and 4 RCS T1. Still couldn't get it above 38% power usage on Omicron . . . which is where she was built
I can see that you swapped out a few of the small thrusters for medium thrusters, but it's still well under the power requirements. It meets the challenge now, very good job.