I certainly agree that stalling was the main reason for Harvey's incredible rainfall. Irma extremely flooded the North Atlantic side of Florida, and Southern Georgia, and South Carolina. Certainly some of this can be attributed to AGW.
The actual numbers from IPCC models are between 2% and 11% increase in hurricane intensity by the end of the 21st century. Assuming a linear relationship, we are 17% of the way to the end of the century. So currently our increase in hurricane intensity would stand between 0.34% and 1.87%. Rainfall rates associated with hurricanes will increase by 10-15% by the end of the century, which puts us currently at 1.7% to 2.6%.
There are two ways to look at this data. First, one can say the percentages are small. However, using a modest 2% for argument's sake, a 24-hour storm, with flooding, could be extended for another 30 minutes. A lot can happen in that 30 minutes. A dam could give way. Another neighborhood could flood. Water could penetrate an area of electrical equipment. Somebody could be killed in that 30 minutes. When one is the midst of a disaster, 30 minutes is a long time. And that 30 minutes will be more than 60 minutes, for our next generation, and about 100 minutes for the generation after that.