So i bought a laser thermometer just to see what my temps were at idle. After 45 minutes one was 113 F the other 122 F.
Depending on the thermometer and how it was used, that difference may or may not be significant. FYI, infrared thermometers - the laser is just an aiming aid, it has nothing to do with measuring temperature - can deliver inaccurate readings. However, assuming you carefully aim at exactly the same spot and take readings with the thermometer at the same distance, you can get reliable
comparative readings.
For temperature measurements, I use a digital thermometer with K-type thermocouples - inexpensive, readily available, and more than sufficiently accurate - in direct contact with specific, easily-identifiable points on the heatsink. In my testing, the difference between a unit with the older PS and the current one is on the order of 40 degrees F. The former measures ca. 130F, the latter around 90. This difference is consistent with the impression I get when I touch the heatsinks. To be clear, the important temperature is the
junction temperatures of the semiconductors in the unit, and there is no way to directly measure those temperatures. They will always exceed the heatsink temperature by an amount that depends on the
total thermal resistance between the junctions and the ambient air and the
device dissipation: the amount of electrical power that is dissipated as heat in the devices. The main rule of thumb is "cooler is better," within limits.
I have read that active heatsinks, or in this case an okified version, do help keep internal temps down as well.
Forced air movement over the heatsink does help. Ventilation openings in the plate would have helped as well, with no fan required. That would have required some additional steps in fabricating the plate and (possibly) modifications to the heatsink. I can't see a way to make it into anything less than a huge DIY project though, so I don't recommend that level of modification.
I will run the fan when jamming at home and just let them burn up at my once a week one hour gig.
My recommendation is to make sure to power them off when you're not using them.