Tune it for response and perfomance and a guideline of 100/105 degc is OK.
The engines that come with it are SH .12 and they are very nice engines.
The std clutch springs are a bit soft and to me feel like they bog the engine down a bit ,this also agrevates engine temps.
Seeing you play around with offroad buggies try 1mm or 1.1mm clutch springs.
My sons Le Mans we use 1 ally shoe with 1.1mm clutch springs.
But it would depend on track or surface you run on.If you have good traction the harder springs would work well.
casterracing EX-1 Pro, SP Silver Arrow
TOP Racing Scythe, SP 17.5, SP GT Pro 2.0
TOP Racing Scythe, SP 4.5 V2, Hobbywing Xerun 120SD 2.0
TOP Racing Scythe, SP 13.5, Hobbywing Xerun 120SD 2.0