Same thing, when I use 2.5mm jets it works much better than with 2mm jets due to less pressure.
Fed up with it now though, can add some stress to your day when its up in the air and your pulling away on the hose. I just kink the hose now between windows and only use the valve when finished.
It's quicker and easier, if you let the hose starighten out slowly after kinking it you dont get that sudden brust of pressurised flow.