To be honest guys, I have yet to fire up the sprayer yet.

Along with trying to manage the lawn on weekends, I am rebuilding my father-in-laws 2002 F250 7.3L Powerstroke. I am about 2 weeks away from completing that project.
I need to turn the sprayer on and make sure it matches the calibration table I got in the manual. In regards to modifications, I won't know till I turn it on and start using it. I am sure there are going to be some things I want to change. The nice thing about this pump is that if my regulator is set below 60PSI the pump will continue to run and when not spraying.
I am holding off on spraying anything until I level out some ruts in the yard which I plan on starting in July. Going to get a full truck load (about 12 yards) and I am going to have to take time off work for that one because once I get that masonry sand delivered I ain't stopping till its out.
I am going to be using an AgFab 17 Cu. Ft. pull behind trailer to haul some sand around. Then I am going to just knock the sand down with a leveling rake I have. I do not need anything massive to spray the sand because these ruts are rather isolated to themselves. Whenever I had the trees trimmed, the Arborist did what he could to minimize the impact on the yard from the equipment.
After the ruts are filled, I am going to start using some MSMA and Dithiopyr L. But I really want to pick up a smaller sprayer of some sort first and try out a really small localized area to test the MSMA out and get comfortable with it.
As of right now, I am feeding portions of my lawn some slow release fertilizer. I am taking my 50lb spreader and just walking around the 5 acres with it. lol I am just trying to make sure the grass is getting its good before I start targeting these weeds and filling the ruts.