Your blade lateral tilt comes from the smaller cyls on the ends of the blade. Pair your lift cyls with one valve.
Which radio you intending to use?
Using F mode, F1 could have your tilt cyls (side of blade cyls) working opposite each other in one mix for maxium lateral tilt, then in F2 they could be cycling same direction to carry or dump.
I've never tried such programming myself, but I think it should be possible.
I see that Premacon is using a much smaller servo with these steel valves, that must be the advantage to steel - a rotary valve turns easier with high pressure.
They must have held that piece with pliers while they tapped it?