Melting a solder joint is usually an indication of excess amp draw. Others have used similar props and stock motor on 6 with reported success, but a lot depends on how you run the boat (see link below). WOT most of the time is better than part throttle. Running all the way to LVC is a bad idea with high amp draw setups. A free-running driveline is necessary, with a decent gap between the drive dog and strut. The boat also has to be running loose to reduce amp draw.
Not knowing anything else about your setup, I would switch to the recommended x442 prop to see if that reduces temps with the stock setup. But that motor is not optimal for 6S if you want trouble-free running, it is really a SAW-type motor. A motor like the TP 3640/1570 would be more versatile, and safer on 6S. This should be safe with the current prop and allow larger props - perhaps up to an x645 and speeds deep into the 60s. I?ve had great success with the Raider 150 ESC on 6S setups. As always, start with short runs to check temps.
https://forums.offshoreelectrics.com/showthread.php?60310-X442-prop-test-on-the-UL19
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