c_g I a kind of suprised by you saying
Bike was extremely muddy yesterday and was disappointed with the pressure I was getting with it, used plenty of water too. Hence my question about the Mobi,
One of the guys i ride with has a nomad and it seems as powerfull as the mobi one i have. Have you had a look at video on the Nomad website to see how you can adjust the nozel for a more powerfull jet?
Also reading the instructions for my mobi one of the things it mentioned was there is a water filter inside the main water container that may need cleaned every now and then. This may be the same with yours so also worth a look if there are any service guide on the site especially if it has sat arround for a bit.