I saw one vid on you tube and have to agree with him...
The first thing you need to do is throw the red nozzel, lol.
Now bk to it,, you need to sort out a flat surface cleaner. My machine is 3000 psi but only 8lpm and i have a 15" quick release fsc which for me works well on slabs. When time allows (plus finances) i need to improve the machine to more like 21 lpm which will work wonders on blocked pathing with a fsc.
But i would have thought at 17lpm, should be ok for you.