If a Silca frame pump won't pump higher than 75 or 80, then likely the seals in the pump head need to be replaced, and/or the main diaphragm needs to be greased or possibly replaced. 110+ no problem with a Silca in good condition. They are trickier to use than a Zefal HP/HPX, and require technique and a bit of strength.
It's kind of funny that the reissues are on the heavy side. The main reason people used Silcas BITD was because they were very light. Perhaps they figure the target market demographic is not longer worried about a few ounces here or there...
