The sample is ~1 kg. That is much more material than you were using years ago. That's good! I am very pleased to see that people are increasing the mass of reactant. I believe that is why the level of heat increased. I believe more heat comes from a larger number of active sites.
Okay, that may seem like an odd thing to say. It may seem obvious that heat will increase as the mass of reactant increases. But I do not think that has been tested -- or demonstrated -- up until now. We just assumed that is how it works.
Even what we consider obvious aspects of the phenomenon should be tested. It is possible that a giant mass of reactant might have no active sites. Or it might sinter and stop working.
I am pleased to see larger samples being tested, but that does not mean small scale tests such as Beiting and Staker are useless. They do superb calorimetry and their signal to noise ratio is high, so there is much to be learned from their tests as well. I am glad to see high s/n small-scale tests AND glad to see scaled-up tests. Both are valuable.
Note that Staker also reported run-away heat events. I believe they are roughly similar in scale to this, when you adjust for the amount of reactant and surface area.