I ended up digging the first two heads and piping to check for leaks "thinking" it seemed damper then the rest of the yard. I figured that where the leak was....none was found. I disconnected the heads, cleaned them, put the heads back on and the pressure is much better. The heads raise about 3/4 of the way. So to be honest not 100% sure what the cause was but something did help.
TYVM for the response.