I bought this pull behind sprayer last summer at a garage sale. I was not impressed with the spray pattern when pulled over the concrete. I did not feel it covered the full width evenly. My question is what modifications can i make or should i just put two new spray tips maybe different ones on the sprayer. The pump seems to work great, i took the tips off and cleaned them and it did not seem to help. The lines definitely need replaced any advise is appreciated. The pump is a shurflo 60psi 1.4 gpm.