Dont go there ... tweaking and fiddling / playing with controls lines / feedback lines can do more harm on your equipment.
Use proven and reliable linear models brand with ocp ovp short overheat protections ... If you hate the heat as you wrote, go with proven reliable SMPS model / brand, avoid china stuff.
At 15volts and 5 amps you already have 75watts of heat dissipation.
Why ? digitally controlled ones may lack speed of reactions / feedback control on some types of loads ...
Played with Lambda LLS and LMS series, they where old in the architectures, motorolla hc08 cpu series, very loud and noisy fan, but very stable and rock solid, but pricey ..
Cheap china buck boost models aren't isolated on the outputs until you use and transformer based supply to feed them, and when they fail, it can get ugly.
Smps have less noise on the output, less heat dissipation, but tend to have bad reactions on certain types of loads ... unless having good / industrial models = pricey
Mastech ang GW Instek or any clones have many control quality issues, fully check them before playing with them, had many smps ones failed in the mosfets stages ... the linears models almost never failed, 1 bad relay changed once, some linear models have relays to limit the heat dissipation, nice feature.
my 2 cents experienceon a side note :
Purchased out of curiosity an Kikusui PAD model, they are based on SCR bridge rectifiers instead of an standard rectifier bridge ... they can output tons of watts with an small footprint, very low noises, low heat dissipation and very good protections
1u rack mount chassis can go up to an 1K Watt, some Sorensen, Xantrex, Power Ten, SCR models are based on the same principle.
I use an old Kepco ATE75-8 psu, an 57 pounds baby, recapped entirely, added 4 1/2 digit panels dmm instead of needle meters, changed the original pots to 10 turns pots was the greatest idea,
modded the fan to an thermally controlled one helped a lot, you dead short this puppy and have an wonderful 864watt heater in your room loll, it was running very loud. You have to know what you're doing ... i have the schematics.
And most importantly of all, be sure you can get an service manual just in case of ....