Bit late on this but I've had the pcb on my alien go into the the 50's with no issue. Im using my al85 which is currently at 43 degrees Celsius with a T6, 2.0 ohm n baby beast tank at 70 watts which I guess is the little brother but I'd expect them to act similarly as it's based on core temperatures of a sort. I find after 'chain vaping' for an hour or so, up to 3 and probably over, it fluctuates between 38 - 45. Never seen it above 45 though. There are always environmental factors as previously mentioned I this thread. Doubt this helps at this point but had to comment because I signed up due to finding this thread and the fact I'm looking for advice myself!
Thank you very much for the advice!! Super big help