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60 psi is probably enough, with reservations. Are you sure your gauge is accurate? When gauges are off, and most are, they will more likely give a high reading than a low reading. For those who pump to 140psi it just doesn't matter if the real pressure is 120. If your 60 was really 50 it could matter. There is a situation where how-low-can-you-go stops working, even if it feels fine while just riding along. Downhill nearly all the weight of bike and rider is on front wheel. Under hard braking all of the weight of bike and rider is on front wheel. Braking on a bike will produce a maximum g force of 0.5 to 0.6. So under hard braking 200# of bike and rider place a load of 300-320# on the front tire. Again, for those who inflate high it won't matter. If anything compressing the tire against the road a bit probably improves handling. But if the real pressure is 45 or 55 who knows. And then you hit a rock or a pothole. There is a whole lot of practical experience that says many of the fine distinctions us obsessives indulge make no difference. There is not all that much practical experience with quality supple tubulars at real low pressures. In the context of riding bikes daily on public roads the ultra low pressure CX riders have been using for only a few years doesn't count.