Selgas
I tend to agree 40PSI inlet pressure to a residence is low and given that the property is two storied that makes it even worse. The higher you try and push the water up the poorer the water pressure and flow will become.
It can be overcome by connecting a pressure pump at the house thereby increasing the “Head” or pressure for the household itself.
It is possible that some of the fittings may be adding to your worries but I suspect it is more that the supply pressure is so low to start with. 
