Insane ly low Pirelli Rosso IV PSI chart!

The link you posted didn't work for me, at least on mobile but I can guess that you must be looking at a track tire or the pressures for track racing cause those are the temps I run my Pirelli slicks at on my track bike. 

Although I'm not personally familiar with the Pirelli Rosso, I imagine based on my personal experience spending a lot of time testing tire pressures in the canyons, that any hot pressure under about 30 PSI is going to cause sidewall collapse and give you that flat tire feeling.

To absolutely stretch tires like the S2X or the Dunlop QX to absolute peak performance, I would usually run them around 31F/30R hot. For a less aggressive but still demanding ride, I'll run those as cold temps, mostly to save with tire wear.

When I 2 up or go out on night rides in the city, I will bump those pressures up over 36 PSI and even higher in the rear if I am 2 Up. Yup, when you burn through tires in 2-3k miles, you literally develop pressures for the different styles of riding you might do. Haha

36F/42R that I think the manual recommends, is certainly a little too high in the rear for my liking. But is absolutely acceptable when commuting or wanting to reduce tire wear and I have run those on straight line riding 2 Up and it is fine. But really, if you're going to do that, get a commuting tire. The stock tires are GREAT tires and my favorites on the street. But they are performance tires definitely and will wear down as such.