What type of pressure will you be looking at after the installation of the booster pump? What type of booster pump is it? If you measure 34 PSI and your Point of Connection, by the time the water hits the sprinkler heads, you are not going to have a whole lot of pressure to work with. I wouldn't suggest using the I-20 heads unless you have are going to have a static pressure of at least 50-60 PSI.
Tony Posey
Ridge Run Landscapes