Restrictor and Bubbles Question

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Hi Richard. it's been a while

I was doing some maintenance and wanted to get my water meth back on track.

Just a reminder. I still have the restrictor in place and am running twin 0.7mm nozzels.

1.What nozzel or flow rate would be recommended on a K04 2L engine. It puts out roughly 300whp.
2. If the restrictor is still in place and I am running the twin setup that I have of 2x 0.7mm valves. Would the pressure be reduced to 0.9mm via both valves to say 0.45mm . If this is the case then I presume I would be getting less than optimal pressure currently even though on an external test it seems to work really well.
3. I noticed after the water injected test that the nozzel sits and drips 2 or 3 drops. Also that some bubbles slowly make there way back up the lines from the nozzels. What could be causing this ?