I have a lot of rolls of the old 50/50 that I had in stock when California made the transition, I think the 95/5 is just fine but I use a TurboTorch acetylene torch.
The melting point of the 50/50 is a lot lower and makes it a lot easier to work with.
That said, I’ve had no problems with 95/5 using MAP gas.
Today’s MAP gas is nothing like the MAP gas in the 90s, though. The formulation changed. But it still gets hot enough to do the job with a small torch up to 1” copper.