Never used pro tech gas, so I assume it’s similar to most green gas. With TM pistols, I always run green gas or rather propane. What you sometimes find is if you put really high pressure gas in the mag, the hammer spring isn’t strong enough to depress the valve on the mag. Easy way to test would be to put your mag in the fridge for 15 mins, take it out, fill it with whatever gas you want you use and test fire it.
Mws should be fine. I run mine on propane all year round. If it’s 0 or below I’d use MAP gas