Just wondering if anybody would know why when i have my raven 460 on manual mode i can build pressure and spray out nozzles fine. When i go and put on whatever rate im going to spray and start moving the pressure goes basically to zero. Trying spray 15 gpa. Using the yellow xr tips. Speed works. Did a reset on raven and added all the numbers back in for valve cal , speed cal , boom cal. And double checked it all