DIY Mic Pre Kits, Lunchbox Mic Preamp Kits, Power Supply Kits

Hi. I'm using the PSU-2448mk2 to power two api 312s and an GSSL buss compressor in one unit. I'm powering all three cards with +-16V DC from the PSU. The voltages at the pres and the GSSL are all perfect and the unit sounds amazing. My quesion is: I noticed the voltage regulators for the +-16V are really hot. I'm assuming they are doing their job, but the voltage coming into them is +-27 after the rectifiers. Worth mentioning, I'm using the power transformer provided by FiveFish on the project. I'm just curious if this is acceptable?