I have a vintage silca impero with a campy head, which I carry mostly for show. And I have had trouble getting high pressures from it as well, although fortunately my schwalbe marathon supreme 700x50 don't need much (I can get by on as low as 30 in the rear, but the silca will get me up to 50-60 before it gets obnoxiously difficult).

One thing that can help just a little bit is to get the wheel horizontal, and the pump straight up in the air. Get the back of the wheel either against the ground, or on your lap, so you can use both hands to work the pump, rather than one hand to hold the wheel, and one hand for the pump. You can also get a little bodyweight into it that way, especially if the wheel is on the ground.

Of course, there's also always CO2, let a machine apply the pressure for you, you just let it out when you need it.