I just started out and thought that I could by a 30" surface cleaner and do more in less time. I didn't realize my pw was to small. I have a cold pw, 3750 psi, 4gpm. I bought a mosmatic 30". My main problem is it leaves a 3" stripe that is noticably cleaner than the rest of the pass. But only on the left side. The bars aren't bent and it seems to be level everywhere. Is my problem that the unit is just to big for my pw. It is a tri arm. If I went to a double would this help.I just paid 850.00 for this surface cleaner and it doesn't work for me. Any suggestions.