The purist might not like this, but since it is already heavily modified I decided to completely replace the old linear PS with a modern switching PS. With the two drives, 5 linear regulators, rectifier and massive transformer, the unit was getting way too hot. Now the peak power usage of the entire unit is about 60W. It still get's warm due to the poor ventilation, but not any worse than a stock Atari drive.
Before/After