With the plate & the _proper_ valve(s) that you mention, the 3pt will operate properly too. Any old cheap valve from TSC will give you the unpredictable 3pt/ cylinder problems you mention. I'd sure not want to have to battle that 3pt issue just to save a few bucks.....
There are single acting valves. Only have pressure one way.
There are double acting valves. Generally they will work with single-acting cylinders as well, but you end up bypassing the oil so your hyds grunt a little & it lowers slower....
There are double-acting valves that have a tiny valve on them to change them easily to true single-acting or true double-acting.
You will want a double acting valve - just better & you have a need.
A second single acting; or if the double-acting you get has the little bypass valve - would be better for you. But not absoulutely needed - just in case money is an object & I spent all yours on this proper valve already. :)
Hope I helped add to the confusion. :)